噴射模式對高壓縮比甲醇發(fā)動機爆震特性影響的試驗研究
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關(guān)鍵詞：甲醇；高壓縮比；爆震特性；爆震抑制；噴射策略
中圖分類號：TK431文獻(xiàn)標(biāo)志碼：A
DOI：10.7652/xjtuxb202507011 文章編號：0253-987X（2025）07-0108-10
Experimental Study of the Effect of Injection Mode on Knock Characteristics of High Compression Ratio Methanol Engines
YU Lixin，YIN Xiaojun，WANG Xibin，DUAN Hao，HU Erjiang，ZENG Ke （School of Energy and Power Engineering，Xi'an Jiaotong University，Xi’an 71oo49，China）
Abstract： To investigate the knock suppression methods for high compression ratio methanol engines， an experimental study is conducted on a single-cylinder naturally aspirated spark-ignition methanol engine with a compression ratio of 15：1 ，focusing on the impact of injection modes on knock characteristics under stoichiometric mixed gas conditions.First，the influence of load， ignition timing，and air-fuel ratio on knock characteristics is explored under the intake port injection mode. Second，the effect of injection timing on knock characteristics is examined under the direct injection mode. Finally，the suppression efect of multiple injection strategies on knock is analyzed under wide-open throttle conditions. The results indicate that in the intake port injection mode， the methanol engine experiences knock combustion at medium to high loads，with a strong knock phenomenon characterized by low frequency and high intensity，reaching a maximum knock intensity of 8.42MPa at an indicated mean effective pressure （?i） of 0.7MPa . In contrast，under the direct injection mode，the knock phenomenon is significantly suppressed，with the maximum knock intensity dropping to 0.43MPa when ?i is 0.91MPa .A reasonable two-injection strategy further reduces knock intensity compared to a single injection strategy while maintaining a highρi . This study confirms the effectiveness of combining direct injection with a two-injection strategy in suppressing knock phenomena in high compression ratio methanol engines，providing theoretical basis and data support for the development and application of methanol engines.
Keywords： methanol；high compression ratio；knock characteristics；knock suppression； injection strategy
化石燃料的持續(xù)消耗引發(fā)了愈發(fā)凸顯的環(huán)境污染和全球變暖問題，威脅著人們賴以生存的環(huán)境，同時制約了經(jīng)濟社會的發(fā)展。（剩余14265字）