The design of advanced turbomachinery has been practiced in the last half of the previous century with increasing degrees of sophistication while continuously advancing levels of efficiency and regimes of stable operation. This trend of development is not complete; products have not reached a level of full maturity. There is considerable room for further development of most turbomachinery products today when looked at with the perspective of the broadest possible design world. Modern design no longer concerns itself only with efficiency and stability, but adds significant issues of weight, life, cost of manufacturing, marketability, and so forth. Decisive factors in each area are considered in this paper and consideration is given to developing trends.

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