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首页> 外文期刊>Arabian Journal for Science and Engineering >Performance of a Heavy-Duty Turbocharged Diesel Engine Under the Effect of Air Injection at Intake Manifold During Transient Operations
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Performance of a Heavy-Duty Turbocharged Diesel Engine Under the Effect of Air Injection at Intake Manifold During Transient Operations

机译：瞬态运行中进气歧管处空气注入的作用下重型涡轮增压柴油机的性能

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摘要

The effectiveness of an air injection technique for the improvement in transient response of heavy-duty turbocharged diesel engines has been investigated but only to a limited extent.In the present work, the investigations are performed to improve the response characteristic of a heavy-duty turbocharged diesel engine under the transient event of rapid acceleration at low engine speeds. The engine model is developed using Ricardo wave software; and after the validation with the data obtained from the real engine, wave model is used to investigate the effectiveness of an air injection system for the improvement in performance of turbocharged diesel engine. The effect of air injection is observed by varying the air injection pressure and the time of acceleration. The turbocharger's response parameters such as the compressor exit pressure, turbine inlet temperature and turbine inlet pressure have been monitored to quantify the turbocharger lag. A pressure value of 1bar is found to be the optimum injection pressure value that significantly reduces the turbocharger lag corresponding to all the selected parameters. Furthermore, faster recovery time is observed for the tests with 1s duration of acceleration than that with 2s duration of acceleration. Turbo lag reduction in percentage per unit energy is found to be 29.0%, 39.2% and 55.5% per Joule based on compressor exit pressure, turbine inlet pressure and turbine inlet temperature, respectively, at 1bar of air injection pressure.
机译：已经研究了空气喷射技术对于改善重型涡轮增压柴油发动机的瞬态响应的有效性，但是仅在有限的程度上进行了研究。在当前工作中，进行了研究以改善重型涡轮增压柴油机的响应特性。柴油机在低转速下迅速加速的瞬态事件下。引擎模型是使用里卡多wave软件开发的；在从实际发动机获得的数据进行验证之后，使用波动模型来研究空气喷射系统对改进涡轮增压柴油机性能的有效性。通过改变空气注入压力和加速时间可以观察到空气注入的效果。涡轮增压器的响应参数（例如压缩机出口压力，涡轮进口温度和涡轮进口压力）已得到监控，以量化涡轮增压器的滞后时间。发现1bar的压力值是最佳喷射压力值，可以显着减少与所有选定参数相对应的涡轮增压器滞后。此外，对于持续时间为1s的测试，其恢复时间要比持续时间为2s的测试的恢复时间更快。在1bar的空气注入压力下，基于压缩机出口压力，涡轮机入口压力和涡轮机入口温度，涡轮机每单位能量百分数的滞后量减少分别为29.0％，39.2％和55.5％。

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