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      |本期目錄/Table of Contents|

      [1]郭喆晨,黃勇成,施永生,等.采用非同步進氣正時和增壓器匹配提升天然氣發動機的低速性能[J].西安交通大學學報,2019,53(09):55-60+78.[doi:10.7652/xjtuxb201909008]
       GUO Zhechen,HUANG Yongcheng,SHI Yongsheng,et al.Low-Speed Performance Improvement of Natural Gas Engine by Asynchronous Intake Timing and Turbocharger Matching[J].Journal of Xi'an Jiaotong University,2019,53(09):55-60+78.[doi:10.7652/xjtuxb201909008]
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      采用非同步進氣正時和增壓器匹配提升天然氣發動機的低速性能(PDF)

      《西安交通大學學報》[ISSN:0253-987X/CN:61-1069/T]

      卷:
      53
      期數:
      2019年第09期
      頁碼:
      55-60+78
      欄目:
      出版日期:
      2019-09-10

      文章信息/Info

      Title:
      Low-Speed Performance Improvement of Natural Gas Engine by Asynchronous Intake Timing and Turbocharger Matching
      作者:
      郭喆晨1 黃勇成1 施永生2 劉偉2 韓志玉3
      1.西安交通大學能源與動力工程學院, 710049, 西安; 2.江蘇上淮動力有限公司, 223005, 江蘇淮安; 3.同濟大學汽車學院, 201804, 上海
      Author(s):
      GUO Zhechen1 HUANG Yongcheng1 SHI Yongsheng2 LIU Wei2 HAN Zhiyu3
      1.School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China; 2.Jiangsu Smapow Engine Co.Ltd., Huai'an, Jiangsu 223005, China; 3.College of Automotive Studies, Tongji University, Shanghai 201804, China
      關鍵詞:
      天然氣發動機 非同步進氣正時 增壓器匹配 低速扭矩
      Keywords:
      natural gas engine asynchronous intake timing turbocharger matching low-speed torque
      分類號:
      TK474
      DOI:
      10.7652/xjtuxb201909008
      摘要:
      為了提升由增壓汽油機改造的天然氣發動機的低速性能,設計了同步進氣和非同步進氣結合增壓器匹配的優化方案,并通過臺架試驗和數值模擬的方法研究了各方案對天然氣發動機性能的影響。天然氣發動機匹配比原汽油機小的增壓器顯著提高了低速時的增壓比,進而增加了進氣流量。采用比原汽油機進氣持續角和進氣遲閉角小的同步進氣方案,減小了發動機低速時的進氣末期回流,使得低速時進氣流量顯著增加; 在此基礎上,采用非同步進氣方案,其中一個進氣門的進氣持續角進一步減小,導致低速時進氣流量進一步增加,相對原機方案進氣流量最大增加了46%,而另一個進氣門進氣持續角和進氣遲閉角較大,保證了高速時可充分進氣。采用非同步進氣方案時缸內流動狀況得到改善,最大燃燒放熱率顯著增加,燃燒持續期略有縮短。天然氣發動機的性能經過優化后,相比原汽油機,低速扭矩最大提高了55.6%,經濟性也有所改善,低速燃氣消耗率最大降低了8.1%。
      Abstract:
      Optimization schemes of synchronous and asynchronous intake timing combined with turbocharger matching are designed to improve the low-speed performance of a natural gas engine modified from a turbocharged gasoline engine.Then bench test and numerical simulation are used to investigate the effects of different intake optimization schemes on the performance of the natural gas engine.It is found that the boost pressure and the intake flow rate of the natural gas engine at low speeds increase obviously by matching a turbocharger smaller than that of the original gasoline engine.The backflow at the end of intake stroke is reduced at low speeds when adopting the synchronous intake timing scheme with a smaller intake duration angle and delayed closing angle, which results in an obvious increase in the intake flow rate at low speeds.When adopting asynchronous intake timing scheme, the further decreased intake duration angle of one intake valve may lead to a further increase of 46% in the intake flow rate at low speeds compared with the original scheme; the other intake valve with larger intake duration angle and delayed closing angle ensures sufficient intake flow rate at high speeds.At the same time, the asynchronous intake timing scheme can improve the in-cylinder flow, increase the maximum heat release rate, and slightly shorten the combustion duration.After the optimization of the turbocharged natural gas engine, the low-speed torque is increased by 55.6%, which exceeds that of the original gasoline engine.The low-speed fuel economy is also improved, and the brake specific gas consumption is reduced by 8.1%.

      參考文獻/References:

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      備注/Memo

      備注/Memo:
      收稿日期: 2019-04-08。作者簡介: 郭喆晨(1993—),男,碩士生; 黃勇成(通信作者),男,副教授;痦椖: 國家重點研發計劃資助項目(2018YFB0105900)。
      更新日期/Last Update: 2019-09-04
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