Real-Time Measurement of Vehicle Exhaust Gas Flow

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Description

A flow measurement system was developed to measure, in real-time, the exhaust gas flow from vehicies. This new system was based on the vortex shedding principle using ultrasonic detectors for sensing the shed vortices. The flow meter was designed to measure flow over a range of 1 to 366 Ips with an inaccuracy of ~1o/0 of reading. Additionally, the meter was engineered to cause minimal pressure drop (less than 125mm of water), to function in a high temperature environment (up to 650oC) with thermal transients of 15 oC/s, and to have a response time of 0.1 seconds for a 10% ... continued below

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11 Pages

Creation Information

Hardy, J.E.; Hylton, J.O.; Joy, R.D. & McKnight, T.E. June 28, 1999.

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Description

A flow measurement system was developed to measure, in real-time, the exhaust gas flow from vehicies. This new system was based on the vortex shedding principle using ultrasonic detectors for sensing the shed vortices. The flow meter was designed to measure flow over a range of 1 to 366 Ips with an inaccuracy of ~1o/0 of reading. Additionally, the meter was engineered to cause minimal pressure drop (less than 125mm of water), to function in a high temperature environment (up to 650oC) with thermal transients of 15 oC/s, and to have a response time of 0.1 seconds for a 10% to 90!40 step change. The flow meter was also configured to measure hi-directional flow. Several flow meter prototypes were fabricated, tested, and calibrated in air, simulated exhaust gas, and actual exhaust gas. Testing included gas temperatures to 600oC, step response experiments, and flow rates from O to 360 lps in air and exhaust gas. Two prototypes have been tested extensively at NIST and two additional meters have been installed in exhaust gas flow lines for over one year. This new flow meter design has shown to be accurate, durabIe, fast responding, and to have a wide rangeabi~ity.

Physical Description

11 Pages

Source

  • International Symposium on Fluid Flow Measurement, Denver, CO, June 28, 1999

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  • Other: DE00006230
  • Report No.: ORNL/CP-102550
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 6230
  • Archival Resource Key: ark:/67531/metadc690499

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Creation Date

  • June 28, 1999

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

Description Last Updated

  • June 10, 2016, 5:24 p.m.

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Hardy, J.E.; Hylton, J.O.; Joy, R.D. & McKnight, T.E. Real-Time Measurement of Vehicle Exhaust Gas Flow, article, June 28, 1999; Oak Ridge, Tennessee. (digital.library.unt.edu/ark:/67531/metadc690499/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.