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高原環(huán)境車用柴油機與輔助系統(tǒng)耦合仿真
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軍隊科研項目(2010WG02、2011CJ016)


Coupled Simulation on Vehicle Diesel Engine and Auxiliary System in Plateau Environment
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    摘要:

    采用噴霧模擬試驗與優(yōu)化算法對柴油機缸內(nèi)準維模型進行高原試驗修正和校正,運用直接耦合方法,建立具有變海拔適應(yīng)性的某重型車輛動力裝置(柴油機及輔助系統(tǒng))工作過程全耦合數(shù)值仿真模型:根據(jù)準穩(wěn)態(tài)流動的統(tǒng)一化阻力和傳熱方程,建立車輛進氣系統(tǒng)阻力模型;基于一維非穩(wěn)態(tài)可壓縮流體動力學(xué)理論和傳熱理論,建立噴油系統(tǒng)工作模型;考慮潤滑油對傳熱量的影響,建立柴油機冷卻系統(tǒng)模型;各輔助系統(tǒng)模型與柴油機工作過程實現(xiàn)耦合計算,即計算中柴油機與輔助系統(tǒng)的邊界條件雙向?qū)崟r傳遞。試驗驗證了耦合仿真的準確性。結(jié)果表明:海拔高度4500m,外特性工況,功率最大下降45%,燃油消耗率最大增加71%;高原缸內(nèi)熱流分布中需要冷卻液帶走的熱量比平原增加48.6%;活塞-缸套-缸蓋溫度場整體升高,最高溫度增加85~91K。海拔高度3700m,水泵揚程最大下降3.9m;單獨增加水泵流量,散熱器進出口水溫整體升高。

    Abstract:

    Diesel engine quasi-dimensional model were corrected by test in plateau. The full-coupled working process simulation model with variable altitude adaptation on certain heavy-duty vehicle propulsion (diesel engine and auxiliary system) was set up. According to the quasi steady state flow uniformity resistance and heat transfer equations, air intaken system resistance model were established. Based on 1-D unsteady compressible fluid dynamics theory and heat transfer theory, the working model of fuel injection system was erected. Considering the effect of lubricating oil on heat transfer, the engine cooling system model was established. Auxiliary system model and the working process of the engine were coupled, that means, the boundary conditions was two-way delivered. Simulation model were verified by experiment. The results show that the power reduces by 45% and fuel consumption increases by 71% at maximum at 4500m altitude under external characteristic working condition. The heat quantity of cooling liquid in heat-flux distribution increases by 48.6%. The temperature field of piston-cylinder sleeve-cylinder head raises apparently, the peak temperature increases by 85~91K. The delivery lift of water pump drops by 3.9m at most at 3700m altitude. When the water flow grows up, the thermal load of cooling system raises.

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郭猛超,王憲成,袁善勇,張晶,孫志新.高原環(huán)境車用柴油機與輔助系統(tǒng)耦合仿真[J].農(nóng)業(yè)機械學(xué)報,2013,44(7):17-22. Guo Mengchao, Wang Xiancheng, Yuan Shanyong, Zhang Jing, Sun Zhixin. Coupled Simulation on Vehicle Diesel Engine and Auxiliary System in Plateau Environment[J]. Transactions of the Chinese Society for Agricultural Machinery,2013,44(7):17-22.

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  • 在線發(fā)布日期: 2013-06-20
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