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近年来,在汽车发动机增压装置中广泛采用径流式废气涡轮。由于这种涡轮的转速很高。用液力制动器直接测量功率是有困难的。因此,在试验这种涡轮时,采用离心式压气机作为制动装置。但是,其消耗功率的范围所受限制极严。当发动机工作时,特别是采用脉冲增压时,涡轮的瞬时功率值往往超出稳定气流时所获得的功率极限,因此最好是用计算法来计算涡轮特性。在大量的计算方法当中,获得最普遍的方法就是假定气体一元流动,尽管这种方法是近似地计算,但它与最普通的计算方法有所不同。用这些方法计算时,由于初始条
In recent years, run-of-the-road exhaust turbines have been widely used in automobile engine superchargers. Due to the high speed of this turbine. It is difficult to measure the power directly with hydraulic brakes. Therefore, in the test of such turbines, the use of centrifugal compressors as a braking device. However, the extent of its power consumption is extremely limited. When the engine is operating, especially when pulsed supercharging is used, the instantaneous power of the turbine tends to exceed the power limit attained by the steady-state flow, so it is best to calculate the turbine behavior using a calculation. Among a large number of calculation methods, the most commonly obtained method is to assume that the gas is a one-component flow. Although this method is approximately calculated, it differs from the most common calculation method. When using these methods, due to the initial bar