In this paper the basic factors controlling blade-section performance are first examined. It is shown that substantial differences in performance may be expected from profiles having different fluid surface velocity distributions. Thus some distributions favour a wide working range while another may be more suitable for very high-speed operation, and so on. A desired velocity distribution may be achieved by appropriately selecting the various physical parameters, such as maximum thickness, position of maximum thickness, position of maximum camber, etc. which define the blade profile. Thus if a particular performance in terms of inlet angle, deflection, Mach number, and incidence and Mach number range, is specified, there will be a particular blade profile to do the job. These conditions will have been determined by the overall design considerations, and the various features which the profile designer can then choose to meet them are fully discussed in the second part of the paper.
In the final section the requirements of some illustrative applications are discussed. It is shown that, on the basis of the earlier parts of this paper, certain applications demand significantly different blade profiles. Evidence is given that substantial gains have been achieved by using the appropriate blade profile for some duties, from which it is concluded that proper attention to the selection of profiles for all duties must lead to an all-round improvement in the performance of these machines.
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