论文部分内容阅读
测量表示,一个离心式压缩机叶轮出口处速度分布往往扭曲得很厉害。所介绍的计算程序是用来估算这个扭曲流动分布。这个流场分二步进行计算。首先,无穷多个叶片的解是用称之谓流线曲率法求得。叶片到叶片的解是用近似方法求得。流动扭曲被认为是由于发生了局部损失而引起的。这些损失是作成了公式和以熵梯度形式引入运动方程。关于叶轮损失的基本成份认为相似于在压缩机性能估算方法中所采用的。介绍了径向的和后弯叶片叶轮实例计算。这个程序给出的流动参数,诸如速度、总压、静压、温度与沿叶片的吸气面和压力面上绝对的和相对的流动角以及从轮(?)到转盖叶片横向宽度。可以认为此结果比从现有的方法中得到的更接近于实际。通过改变设计有可能改善流动均匀性。
The measurements show that the speed distribution at the impeller exit of a centrifugal compressor tends to distort considerably. The introduced calculation program is used to estimate this distorted flow distribution. This flow field is calculated in two steps. First of all, the solution of an infinite number of leaves is called the streamline curvature method. Leaf-to-leaf solution is obtained using the approximate method. Flow distortions are thought to be caused by localized losses. These losses are formulated as equations and introduced into the equations of motion in the form of entropy gradients. The basic composition of the impeller loss is considered to be similar to that used in the compressor performance estimation method. The radial and backward curved blade impeller examples are introduced. The flow parameters given by this program, such as velocity, total pressure, static pressure, temperature and absolute and relative flow angles along the suction and pressure planes of the vane, and the lateral width from the wheel (?) To the cover flap. It can be considered that the result is more realistic than that obtained from the existing method. By changing the design it is possible to improve the flow uniformity.