论文部分内容阅读
气缸内充量的涡流强度是影响汽车和拖拉机发动机工作过程最重要的因素之一。为了在发动机研制阶段评定这一强度,除了采用风速仪之外,还广泛地采用在稳流条件下向气缸盖内进气道吹气的试验方法,以便按反作用式整流格栅测得的累积循环量求出综合的强度参数(苏联189183号发明证书)。近年来,广泛地采用螺旋进气道,因为据稳流装置测定,当螺旋进气道与对比的切向进气道的充量涡流累积强度相同时,螺旋进气道可降低排气烟度并改善燃油经济性。但有螺旋进气道的发动机与有切向进气道的发动机不同。其区别是:当更换按同一图纸制造且充量涡流累积强度差别较小的气缸盖时,前者的有效指标变化较大。
The amount of vortex in the cylinder is one of the most important factors affecting the operation of the car and tractor engine. In order to assess this strength during the engine development phase, in addition to the anemometer, a test method of blowing air into the air intake in the cylinder head under steady-state conditions is widely used in order to accumulate as measured by a reaction-type rectifying grid The amount of circulation to find a comprehensive strength parameters (the Soviet Union 189183 certificate of invention). In recent years, the spiral inlet has been widely used because, as determined by the steady flow device, the spiral inlet reduces the exhaust smoke when the cumulative swirling flow of the spiral inlet and the comparative tangential inlet is the same And improve fuel economy. However, a helical air intake engine and a tangential intake engine are different. The difference is: when the replacement according to the same drawing and the cumulative difference between the eddy current accumulation of small cylinder head, the effective indicator of the former changes.