本文關鍵詞：V型多缸柴油機潤滑系統(tǒng)流動特性三維仿真研究　出處：《北京理工大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 多缸柴油機 潤滑系統(tǒng) 活塞冷卻噴油 流場分布

【摘要】：潤滑系統(tǒng)是柴油機的重要系統(tǒng)之一,是柴油機高效可靠工作的重要保證;活塞冷卻噴嘴將機油噴入冷卻油腔,帶走活塞頂部的大部分熱量,其工作性能的好壞對柴油機的安全可靠運行有直接影響。本文以一臺V型多缸柴油機的潤滑系統(tǒng)為研究對象,對潤滑油道和活塞噴油冷卻的機油流動特性進行了三維仿真研究。本文使用Solidworks建立了柴油機潤滑系統(tǒng)油道和活塞噴油冷卻機油流動計算域的幾何模型,潤滑系統(tǒng)油道模型包括附件托架體內的輔助油道、機油散熱器、機油濾清器、曲軸箱體內主油道以及各潤滑部位的簡化油道等,活塞噴油冷卻模型包括活塞冷卻噴嘴油道、活塞下部腔體、內冷油腔等。本文使用Fluent軟件對潤滑油路標定工況下調壓閥打開時的流場進行仿真研究。結果表明:機油在整個附件托架內的壓力損失為0.352 MPa,在主油道內的壓降為0.145 MPa;主油道中,供油凸輪軸軸承潤滑油道壓力最高,左排主油道壓力最低;右排主油道流量最高,供油凸輪軸軸承潤滑油道流量最低。在各出口中,配氣凸輪軸軸承潤滑油道的泄油量最大,增壓器軸承的泄油量最小,配氣凸輪軸軸承潤滑油道流量不均勻度最高。本文研究了標定工況下調壓閥關閉時,潤滑系統(tǒng)油道機油的流動特性,結果表明:流場的機油壓力比調壓閥打開時整體提高了0.18MPa左右;主油道內,左右兩排主油道流量降低了,供油凸輪軸軸承潤滑油道的流量則提高了;主油道末端出現(xiàn)了右排主油道機油向左排主油道供油的現(xiàn)象;調壓閥之外的所有出口的機油流量都增加了,單體泵潤滑油路的機油流量增加比例最高;只有增壓器軸承出口流量不均勻度減小了,其他出口流量不均勻度都增加了。本文對不同入口流量下、活塞在不同位置,活塞噴油冷卻的流場進行仿真計算。結果表明:機油離開噴嘴后,液柱的直徑變大,液柱呈現(xiàn)中心速度高,周圍速度低的狀態(tài);活塞在下止點到距下止點16mm位置處,機油撞壁點靠近內冷油腔入口,在16mm到32mm位置處,撞壁點位于內冷油腔入口內,在32mm到145mm位置處,撞壁點遠離內冷油腔入口;沒有進入內冷油腔的機油在撞壁后仍然沿壁面流動,機油在撞壁后分散形成了數(shù)條油束;活塞在距下止點16mm、32mm位置處機油全部進入內冷油腔,活塞距在下止點96mm到上止點位置沒有機油進入內冷油腔;活塞在距下止點16mm位置內冷油腔腔內機油體積分數(shù)最高,活塞在下止點內冷油腔壁面的機油體積分數(shù)最高。
[Abstract]:The lubrication system is an important system of the diesel engine, the diesel engine is an important guarantee for efficient and reliable work; piston cooling nozzle oil sprayed into the cooling oil chamber, most of the heat away at the top of the piston, has a direct impact on the safe and reliable operation of the diesel engine. Its performance is based on the lubrication system of a V type multi cylinder the diesel engine as the research object, the oil flow characteristics of lubricating oil and piston injection cooling of 3D simulation. This paper uses Solidworks to establish the geometric model of the diesel engine lubrication system oil and piston oil cooling oil flow of the computational domain, the auxiliary oil lubrication system, oil channel model including bracket body oil radiator oil filter, crankshaft box body, the main oil and the lubricating parts to simplify the oil road, model of oil cooling piston comprises a piston cooling nozzle oil duct, the lower part of the piston cavity, The inner cooling oil chamber. This paper use Fluent software for lubrication rated pressure valve open when the down flow is simulated. The results show that the pressure loss of the oil in the whole bracket within 0.352 MPa, the pressure drop in the main oil channel is 0.145 MPa; the main oil, lubricating oil and camshaft bearing the highest pressure, left the main oil pressure is lowest; the right row of the main oil flow rate is highest, the cam shaft bearing lubricating oil passage. The minimum flow rate in each outlet cam shaft bearing lubricating oil channel to drain the largest amount of oil discharge turbocharger bearing the minimum cam shaft bearing lubrication the oil flow uniformity is studied in this paper. The highest rated voltage regulating valve is closed, flow characteristics, lubrication system oil oil the results showed that the flow field of the oil pressure than the pressure regulating valve is open to improve the overall 0.18MPa; the main oil channel, about two rows of main oil Road traffic is reduced, the cam shaft bearing lubrication oil duct flow is improved; the main oil channel appears at the end of the right row of the phenomenon of oil oil left main oil supply row; oil flow regulating valve outside of all exports have increased, the oil flow rate of single pump lubricating oil increases the highest proportion only; bearing of turbocharger outlet flow uniformity decreases, other outlet flow uniformity are increased. The different entrance flow, the piston in the different position, flow piston injection cooling was simulated. The results show that the oil left after the nozzle, the larger diameter of liquid column, liquid column show center high speed, low speed around the state; the piston in the BDC to stop 16mm distance under oil, hit the wall near the entrance to the inner cooling oil chamber, at the position of 32mm in the 16mm, hit the wall at the inner cooling oil chamber entrance, to the 145mm position in the 32mm, hit The wall away from the inner cooling oil chamber entrance; did not enter the inner cooling oil chamber oil in hit the wall after the still flow along the wall, hit the wall after the oil dispersion formed a number of oil beam; piston check points in the 16mm distance, 32mm position of oil into the inner cooling oil chamber, the piston from the next stop 96mm to TDC no oil into the inner cooling oil chamber; the piston from the bottom dead point position of 16mm inner cooling oil cavity oil volume fraction is highest, the piston in the bottom wall of the inner cooling oil chamber oil volume fraction is highest.

【學位授予單位】：北京理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TK423

【參考文獻】

相關碩士學位論文 前1條

1 孟令軍;某16缸柴油機潤滑系統(tǒng)的模擬與優(yōu)化[D];大連理工大學;2013年

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本文編號：1392715