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Theoretical and Experimental Investigation of the Turbocharged Gasoline Engine Performance Improvement Controlling Inlet Air Temperature

Farzam, Reza | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52553 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Hajilouy Benisi, Ali; Hosseini, Vahid
  7. Abstract:
  8. Today, spark ignition internal combustion engines make up a large percentage of passenger car engines, so their performance improvement is important. Turbocharging of these engines, although is an appropriate method to enhance their specific power and improve their specific fuel consumption, but it has big problems such as the possibility of knock and increasing the NOx emissions in the engine. In this study, resolving these problems is intended by controlling the engine inlet charged air temperature to improve performance of the engine. For this purpose, the investigations are conducted experimentally as well as numerically. The experimental studies are carried out on a turbocharged gasoline engine and the effect of charged inlet air temperature is investigated on the knock, torque, and engine power by providing an engine inlet charged air cooling system. The knock phenomenon is investigated by measuring the spark advance timing. In the numerical studies, after modeling the engine in the GT-Suite® and validating it by experimental results, the effect of inlet charged air temperature is investigated on the specific fuel consumption, specific NOx and cylinder pressure. The experimental results show that by decreasing the air temperature after compressor, the advance timing of the ignition increases and knock decreases in the engine. Also, a 20℃ reduction in intake manifold air temperature causes 4.6 percent increase in volumetric efficiency and 9 percent increase in the brake power. The numerical results likewise show that a 44℃ reduction in intake manifold air temperature causes 2.4 and 3.1 percent decrease in specific fuel consumption and specific NOx, respectively, on average. In fact, cooling the engine inlet charged air is a suitable way to improve the performance of the turbocharged gasoline engine, and higher cooling causes more improvement of engine performance characteristics
  9. Keywords:
  10. Turbocharging ; Cooling ; Performance Improvement ; Spark Ignition Engines ; Stamping ; Charged Air Temperature

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