本文關(guān)鍵詞：級間中冷作用及關(guān)鍵參數(shù)對二級增壓系統(tǒng)的影響研究　出處：《中北大學》2016年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 二級增壓 級間中冷作用 壓比分配 數(shù)值仿真

【摘要】：日益嚴重的汽車排放問題與環(huán)境之間的矛盾在世人的注目之下不斷升溫,近乎成為了全世界討論的熱點問題。伴隨著對發(fā)動機性能的追求不斷提升,發(fā)動機廢氣渦輪增壓技術(shù)從根本上得到了進一步的改進和開發(fā)利用,廢氣渦輪增壓技術(shù)不單單提升了發(fā)動機自身的性能指標,更重要的是降低了發(fā)動機尾氣的排放,呼應了世界“節(jié)能、減排”的主題。二級增壓系統(tǒng)相比單級增壓系統(tǒng),在發(fā)動機動力性和經(jīng)濟性方面有很大的改觀,但級間中冷作用及系統(tǒng)總壓在高、低壓級之間的分配問題對二級增壓系統(tǒng)的影響值得去深入研究和探討。本文采用理論分析的方式探究了二級增壓系統(tǒng)的關(guān)鍵參數(shù)總壓比在兩級之間的分配規(guī)則、膨脹比在兩級之間的分配規(guī)則,壓比分配對二級增壓系統(tǒng)總效率的影響;通過發(fā)動機一維仿真模擬軟件GT-Power建立獨立的帶有級間中冷作用的二級增壓系統(tǒng),結(jié)合試驗值和經(jīng)驗值,設(shè)定了高壓級渦輪的入口條件、入口參數(shù)、低壓級壓氣機的入口參數(shù),并設(shè)置多組不同的工況,通過仿真模擬計算的結(jié)果,分析探究級間中冷器產(chǎn)生的壓降值對二級增壓系統(tǒng)關(guān)鍵參數(shù)的影響;級間中冷器的溫度對二級增壓系統(tǒng)關(guān)鍵參數(shù)的影響。結(jié)果表明:級間中冷器產(chǎn)生的壓降對二級增壓系統(tǒng)的總壓比有直接的影響,中冷器的壓降和高壓級壓氣機的入口壓力固定時,系統(tǒng)的總壓比與高壓級壓氣機的入口溫度有關(guān);高壓級壓氣機未進入失速工況前,隨著中冷器壓降的遞增,高壓級壓氣機的效率有最大值;控制系統(tǒng)的總壓比固定不變,中冷器出口溫度越高,產(chǎn)生的壓降越大;控制級間中冷器的出口溫度固定不變,二級增壓系統(tǒng)的總壓比隨高壓級壓氣機入口壓力的遞增而遞增;級間中冷器的溫度對二級增壓系統(tǒng)低壓級壓氣機的效率沒有直接影響。以上結(jié)論為帶有級間中冷作用的二級增壓系統(tǒng)的進一步開發(fā)奠定了有力的理論基礎(chǔ)。
[Abstract]:The increasingly serious problem of automobile emission and the contradiction between the environment and the world are heating up under the attention of the world, which has become a hot issue in the world, and with the pursuit of engine performance continues to improve. Engine exhaust turbocharging technology has been further improved and developed fundamentally. Exhaust gas turbocharging technology not only improves the performance of the engine itself. More important is to reduce engine exhaust emissions, echoing the world's "energy saving, emission reduction" theme. Compared with single-stage supercharging system, the two-stage supercharging system has a great improvement in engine power and economy. But the interstage intercooling and the total pressure of the system are high. The effect of the distribution problem between the low voltage stages on the two-stage supercharging system is worthy of further study and discussion. In this paper, the distribution rules of the key parameters of the two-stage supercharging system between the two stages are discussed by theoretical analysis. The distribution rule of expansion ratio between two stages and the effect of pressure score on the total efficiency of two-stage booster system; An independent two-stage turbocharging system with interstage intercooling effect was established by one-dimensional engine simulation software GT-Power. The inlet conditions of high-pressure stage turbine were set up by combining the experimental and empirical values. The inlet parameters, the inlet parameters of the low pressure stage compressor, and the different working conditions are set up. The effect of the pressure drop produced by the interstage intercooler on the key parameters of the two-stage supercharging system is analyzed through the results of simulation and calculation. The effect of the temperature of the interstage intercooler on the key parameters of the two-stage booster system. The results show that the pressure drop produced by the interstage intercooler has a direct effect on the total pressure ratio of the two-stage booster system. When the pressure drop of the intercooler and the inlet pressure of the high pressure stage compressor are fixed, the total pressure ratio of the system is related to the inlet temperature of the high pressure stage compressor. Before entering stall condition, the efficiency of high pressure stage compressor has the maximum value with the increasing of the pressure drop of the intercooler. The total pressure ratio of the control system is fixed, the higher the outlet temperature of the intercooler is, the greater the pressure drop will be. The outlet temperature of the control stage intercooler is fixed and the total pressure ratio of the two-stage booster system increases with the increase of the inlet pressure of the high-pressure stage compressor. The temperature of the interstage intercooler has no direct effect on the efficiency of the low-pressure stage compressor of the two-stage supercharging system. The above conclusion lays a strong theoretical foundation for the further development of the two-stage supercharging system with interstage intercooling.
【學位授予單位】：中北大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：U464.135

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