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Experimental Study and Numerical Imulation of Two-Stage Turbo-System on Performance of Diesel Engine

Author: HuZhiLin
Tutor: YaoMingFa
School: Tianjin University
Course: Power Machinery and Engineering
Keywords: Diesel engine GT-Power Stage turbocharging Matching optimization
CLC: TK423
Type: Master's thesis
Year: 2010
Downloads: 182
Quote: 1
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Abstract

With oil resources are depleted and increasingly stringent emissions regulations , how to reduce harmful emissions while maintaining high thermal efficiency is the focus of the current diesel technology . The two - stage turbo technology is an effective means to improve engine performance and reduce emissions . Compared with single-stage supercharged , two-stage supercharger by continuous pressurized intake , can achieve higher compression ratio , at the same time , smaller stage turbocharging system in a high pressure stage match flow range rotor inertia a turbocharger , can better improve the low - speed torque and transient response of the engine . Based on the one-dimensional simulation software GT -Power stage turbocharging system matches the calculation and experimental studies of a six-cylinder high-pressure common rail diesel engine . First , create a calculation model of the original machine , to calibrate the model based on experimental data of the original machine , on this basis , the establishment of the model of the two booster system . The calculation results show that the stage turbocharging system can greatly increase the engine 's intake flow to improve low-speed torque of the engine , improving low speed fuel consumption , while two turbocharged diesel engine with better transient response performance than the original machine . In high - speed conditions , due to the high pressure stage stage turbocharging system flow range is smaller , resulting in engine vortex before the pressure increased pumping losses increases fuel consumption of the engine is increased . The principle of optimal fuel consumption rate , using the GT-Power high pressure stage turbocharger stage turbocharging system and a low pressure stage turbocharger matching, and carry out the appropriate engine bench test match experimental results with the calculated results are more consistent . High - speed conditions appropriate to increase the high pressure stage turbocharger exhaust the bleeder valve aperture , will help to improve engine performance . The resulting end - stage turbocharging program performance and emissions test , and compared with the original machine , the results show that the stage turbocharging system than the original machine CO , HC and PM the weighted emissions have different reduction , but NOx emissions and weighted fuel consumption increased slightly . Finally, the GT-Power software to be improved , the calculation results show that the exhaust gas discharge valve of the high-pressure stage turbocharger to optimize the performance of the engine can be further improved , for the further optimization of the two booster system provides a system model of the two supercharger reference.

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CLC: > Industrial Technology > Energy and Power Engineering > Internal combustion engine > Diesel engine > Structure
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