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Flight investigation of pentaborane fuel in 9.75-inch-diameter ram-jet engine with downstream fuel injection

Description: Report presenting a flight test of pentaborane fuel in an air-launched ramjet engine with a design free-stream Mach number of 1.8. The ramjet used in the investigation had a revised spray bar-flameholder configuration. Results regarding propulsive thrust and propulsive-thrust specific fuel consumption are provided.
Date: April 22, 1957
Creator: Disher, John H. & Jones, Merle L.
Item Type: Refine your search to only Report
open access

Experimental investigation of deposition by boron-containing fuels in turbojet combustor

Description: Report presenting an investigation conducted with trimethyl borate azeotrope and pentaborane fuels in a turbojet combustor. The primary purposes of the study were to determine the effect of boron oxide deposits on the turbine-nozzle area, combustor pressure loss, temperature distribution, and combustion efficiency. Three distinct boron deposit patterns were noted in the investigation.
Date: May 10, 1957
Creator: Kaufman, Warner B.; Branstetter, J. Robert & Lord, Albert M.
Item Type: Refine your search to only Report
open access

Performance evaluation of reduced-chord rotor blading as applied to J73 two-stage turbine 1: over-all performance with standard rotor blading at inlet conditions of 35 inches of mercury absolute and 700 degrees R

Description: Report presenting an investigation conducted to determine the overall performance of the J73 two-stage turbine with a standard rotor-blade configuration. The turbine operated with a maximum brake internal efficiency between 0.91 and 0.92 at an overall pressure ratio of about 3.4 and 120 percent equivalent design rotor speed. Results regarding the overall performance, variation of equivalent weight flow with overall pressure ratio, and effect of limiting blade loading are provided.
Date: July 11, 1957
Creator: Berkey, William E.; Rebeske, John J., Jr. & Forrette, Robert E.
Item Type: Refine your search to only Report
open access

Preliminary investigation of the altitude performance of pentaborane and a pentaborane : JP-4 blend in an experimental 9.5-inch-diameter tubular combustor

Description: From Summary: "A preliminary investigation was conducted to determine the altitude performance of pentaborane and a blend fuel of 64.2 percent pentaborane in JP-4 fuel in a tubular combustor of a current production type turbojet engine. Deposits on the liner barrel and dome were virtually nonexistent. The combustion efficiency of 90 to 94 percent for pentaborane and approximately 90 percent for the blend. Outlet temperature profiles were marginal; however, the developed combustor provided lower… more
Date: April 1, 1957
Creator: Kaufman, Warner B. & Branstetter, J. Robert
Item Type: Refine your search to only Report
open access

Preliminary investigation of the combustion of a 50 percent pentaborane - 50 percent JP-4 fuel blend in a turbojet combustor at simulated altitude conditions

Description: A preliminary investigation was conducted to determine the combustion characteristics of a fuel composed of 50 percent pentaborane and 50 percent JP-4 (MIL-F-5624A) by weight in a turbojet combustor. A combustor designed to fit the housing of a J33-A-23 turbojet engine was selected for convenience. The fuel was evaluated at two engine conditions simulating altitudes of 40,000 and 57,000 feet, an engine speed of 85 percent of rated rpm, and a flight Mach number of 0.6. The pentaborane blend was … more
Date: March 11, 1957
Creator: Branstetter, J. Robert; Kaufman, Warner B. & Gibbs, James B.
Item Type: Refine your search to only Report
open access

The Heat of Combustion of Tetraethyldiborane

Description: "The net heat of combustion of a sample of tetraethyldiborane was found to be 20,400 plus or minus 130 Btu per pound for the reaction of liquid fuel to gaseous carbon dioxide, gaseous water ,and solid boric oxide. The measurements were made in a Parr oxygen bomb calorimeter and the combustion is believed to have been 99 percent complete. A more reasonable value for the net heat of combustion would therefore be 20,600 plus or minus 130 Btu per pound" (p. 1).
Date: January 16, 1957
Creator: Tannenbaum, Stanley
Item Type: Refine your search to only Report
open access

Preliminary Investigation of the Combustion of Pentaborane and Diborane in a Turbojet Combustor at Simulated Altitude Conditions

Description: Report presenting an investigation to determine the combustion characteristics of pentaborane and diborane in a turbojet combustor. Four different test conditions were explored, which varied in inlet total pressure, temperature, and simulated flight conditions. Results regarding the combustor itself and performance of diborane fuel at high altitude are provided.
Date: February 27, 1957
Creator: Gibbs, J. B.; Kaufman, W. B. & Branstetter, J. R.
Item Type: Refine your search to only Report
open access

Performance evaluation of reduced-chord rotor blading as applied to J73 two-stage turbine 2: over-all performance at inlet conditions of 35 inches of mercury absolute and 700 degrees R

Description: Report presenting an investigation to determine the feasibility of utilizing a reduced-chord rotor blading on the two-stage turbine of the J73 turbojet engine in order to reduce the weight. The turbine was operated as a component over a range of speeds and overall pressure ratios at turbine-inlet conditions corresponding to 35 inches of mercury absolute and 700 degrees R. Results regarding the overall performance, performance map, and peak efficiency are provided.
Date: July 11, 1957
Creator: Schum, Harold J.; Rebeske, John J., Jr. & Forrette, Robert E.
Item Type: Refine your search to only Report
open access

Preliminary investigation of combustion of diborane in a turbojet combustor

Description: Boron and its hydrides offer increased flight range relative to conventional fuels for turbojet engines. Preliminary evaluation has been made of the combustion characteristics and deposition problems resulting from burning diborone in a single, modified J33 combustor. A combustor relatively free of deposits for the limited test conditions has been developed. Three possible methods of alleviating deposits on the turbine blades are reported.
Date: February 13, 1957
Creator: Kaufman, Warner B.; Gibbs, James B. & Branstetter, J. Robert
Item Type: Refine your search to only Report
open access

Performance evaluation of reduced-chord rotor blading as applied to J73 two-stage turbine 5: effect of inlet pressure on over-all performance at design speed and inlet temperature of 700 degrees R

Description: Report presenting an investigation of a reduced-chord multistage turbine at design speed and various turbine-inlet pressures from 12 to 40 inches of mercury absolute. At each inlet pressure, the turbine was operated over a range of overall turbine total-pressure ratios; turbine-inlet temperature was maintained at 700 degrees R. The results indicated that no appreciable effect on turbine overall performance was observed over the range of turbine-inlet total pressures investigated.
Date: July 5, 1957
Creator: Schum, Harold J.
Item Type: Refine your search to only Report
open access

Spontaneous Flammability of Pentaborane and Pentaborane-3-Methylpentane Blends

Description: Memorandum presenting a study of the spontaneous flammability of pentaborane and pentaborane-3-methylpentane blends. The behavior of the substances in air and in liquid and vapor states was studied. Results regarding conditions under which pentaborane did not ignite and conditions under which pentaborane did ignite are provided.
Date: February 13, 1957
Creator: Fletcher, Edward A.
Item Type: Refine your search to only Report
open access

Investigation of 70 percent trimethyl borate 30 percent methyl alcohol fuel mixture in a single J33 combustor and in a J33 turbojet engine

Description: Report presenting an experimental investigation on a single turbojet engine combustor and on a turbojet engine using a fuel mixture of 70 percent trimethyl borate and 30 percent methyl alcohol. Results regarding the single combustor's deposition, combustion efficiency, ignition, temperature distribution, pressure drop and the engine operation are provided.
Date: January 23, 1957
Creator: Schafer, Louis J., Jr. & Hickel, Robert O.
Item Type: Refine your search to only Report
open access

Performance evaluation of reduced-chord rotor blading as applied to J73 two-stage turbine 4: over-all performance of first-stage turbine with reduced-chord rotor blades at inlet conditions of 35 inches of mercury absolute and 700 R

Description: Report presenting a study of the first stage performance characteristics of the two-stage turbine from the J73 turbojet engine. The reduced-chord first-stage turbine operated at a peak brake internal efficiency of over 91 percent at a stage overall pressure ratio of 1.4 and at 90 percent of the design equivalent speed. The unit exhibited high efficiency over a wide range of operating variables.
Date: July 5, 1957
Creator: Schum, Harold J.
Item Type: Refine your search to only Report
open access

Performance Evaluation of Reduced-Chord Rotor Blading as Applied to J73 Two-Stage Turbine 6: Stage Performance With Standard Rotor Blading at Inlet Conditions of 35 Inches of Mercury Absolute and 700 Degrees R

Description: Report presenting an evaluation of the stage performance of the J73 turbine on the basis of previous performance investigations of the first stages alone and of the two-stage turbines with standard and with reduced-chord rotor blading for a range of rotational speeds and pressure ratios. The results demonstrated that both of the two-stage turbines and first-stage turbines had comparable performance.
Date: July 11, 1957
Creator: Davison, Elmer H. & Schum, Harold J.
Item Type: Refine your search to only Report
open access

Altitude performance of pentaborane - JP-4 fuel blends in a modified J47 combustor

Description: From Introduction: "Experimental investigations of the combustion characteristics of diborane, pentaborane, and pentaborane-hydrocarbon blends in modified turbojet combustors have been conducted at this laboratory at the request of the Bureau of Aeronautics, Department of the Navy, as part of Project Zip. Results of these single-combustor tests are presented in references 2 to 5."
Date: April 17, 1957
Creator: Branstetter, J. Robert & Kaufman, Warner B.
Item Type: Refine your search to only Report
open access

Preliminary performance evaluation of blends of pentaborate and JP-4 fuel in a full-scale turbojet engine

Description: Report presenting a brief evaluation of pentaborane-JP-4 fuel mixtures in a turbojet engine at a simulated flight altitude of 50,000 feet and a Mach number of 0.8. Engine data included thrust and specific fuel consumption is provided in tabular and graphical form for various fuel blends as well as photographs of the condition of the engine at the end of the investigation.
Date: January 28, 1957
Creator: King, C. R.; Breitwieser, Roland & Sivo, J. N.
Item Type: Refine your search to only Report
open access

Investigation of conditions for spontaneous ignition and combustion efficiency of pentaborane in a small-scale combustor

Description: Report presenting an investigation using a small-scale ramjet combustor to determine the conditions for spontaneous ignition of pentaborane, amyl nitrate, propylene oxide, and JP-4 fuel. For the range of conditions investigated, the threshold of spontaneous ignition of pentaborane is primarily governed by temperature and is also influenced by burner length and configuration. Combustion efficiency was found to increase in burner length and blocked area of the flame holder.
Date: April 30, 1957
Creator: Lord, Albert M. & Morris, James F.
Item Type: Refine your search to only Report
open access

Altitude performance of a full-scale turbojet engine using pentaborane fuels

Description: From Introduction: "The data presented herein include the standard engine performance parameters of net thrust, specific fuel consumption, and engine total-pressure ratio that reflect the performance available from the use of pentaborane as a fuel. The influence of the boric oxide deposits from the high-concentration pentaborane fuels on engine component performance is presented."
Date: February 28, 1957
Creator: Useller, James W.; Kaufman, Warner B. & Jones, William L.
Item Type: Refine your search to only Report
open access

Initial Performance Investigation of Pentaborane Fuel in Free-Flight Ram-Jet Engine

Description: Memorandum presenting an investigation with a ramjet utilizing pentaborane fuel in order to evaluate promising high-energy fuels under actual flight conditions. During descent, the engine accelerated to a Mach number of 1.45 when a flame-out believed due to spray-bar failure took place. Results regarding time history, pressure recovery, thrust, thrust-minus-drag, and drag coefficient, and comparison with hydrocarbon fuel are provided.
Date: January 24, 1957
Creator: Disher, John H. & Rabb, Leonard
Item Type: Refine your search to only Report
open access

Pentaborane Combustion Performance in 9.75-Inch-Diameter Ram-Jet Engine in Connected-Pipe Altitude Facility

Description: Report presenting an investigation of the performance of pentaborane fuel in a flight-type, 9.75-inch-diameter ramjet engine mounted in a connected-pipe altitude facility. Combustor efficiency was above 85 percent throughout the range of test conditions. Results regarding the connected-pipe performance and estimated flight performance are provided.
Date: March 13, 1957
Creator: Fivel, Herschel J.; Tower, Leonard K. & Gibbs, James B.
Item Type: Refine your search to only Report
open access

Influence of boric oxide deposition on turbojet-engine operation

Description: Report presenting testing of a modified production turbojet engine using a trimethyl borate azeotrope as a fuel. Operation with this fuel for 100 minutes produced a 2-percent deterioration in engine speed and only a 1-percent increase in combustor total-pressure loss with the best engine configuration investigated. Results regarding boric oxide deposition, engine operation and performance, effect of turbine-inlet temperature, and dissipation of boric oxide deposits are provided.
Date: February 15, 1957
Creator: Useller, James W.; Burley, Richard R. & Velie, Wallace W.
Item Type: Refine your search to only Report
open access

Flight Investigation at Low Angles of Attack to Determine the Longitudinal Stability and Control Characteristics of a Cruciform Canard Missile Configuration With a Low-Aspect-Ratio Wing and Blunt Nose at Mach Numbers From 1.2 to 2.1

Description: Report presenting testing of a full-scale rocket-powered model of a cruciform canard missile configuration with a low-aspect-ratio wing and blunt nose. Static and dynamic longitudinal stability and control derivatives were determined at low angles of attack and for a range of Mach numbers.
Date: September 30, 1957
Creator: Brown, Clarence A., Jr.
Item Type: Refine your search to only Report
open access

Performance and operational characteristics of pentaborane fuel in 48-inch-diameter ram-jet engine

Description: Report presenting testing of pentaborane as a fuel in a 48-inch-diameter ram-jet engine in a free-jet facility. Each test lasted about 50 seconds and used fast-response instrumentation and prescheduled fuel-flow variation for a range of fuel-air ratios. Results regarding combustion performance, ignition, oxide deposits, and fuel-injector performance are provided.
Date: April 24, 1957
Creator: Rayle, Warren D.; Reilly, Dwight H., Jr. & Farley, John M.
Item Type: Refine your search to only Report
open access

Flight evaluation of the lateral stability and control characteristics of the Convair YF-102 airplane

Description: Report presenting the lateral stability and control characteristics of the Convair YF-102 airplane during flights for the NACA research program. The investigation included gradually increasing sideslips, rudder-fixed aileron rolls, rudder pulses, and trim runs at two different altitudes over the test Mach number range. The lateral handling characteristics appeared satisfactory when viewed in terms of gradually increasing sideslips.
Date: January 16, 1957
Creator: Sisk, Thomas R.; Andrews, William H. & Darville, Robert W.
Item Type: Refine your search to only Report
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