Theoretical and experimental investigations of the disturbing effect of a measuring probe on the profile pressure distribution in a turbomachine

The theoretical investigations reported are based on an application of difference procedures for the computation of the cascade flow. The effect of cylindrical bodies on the cascade flow is investigated, taking into account the streamlines in the presence and absence of a probe. A description of experimental studies is presented. The design of the test turbine is considered along with the approaches used in the determination of the flow disturbance produced by a cylindrical probe. Attention is given to a comparison of computed and experimentally determined guide vane pressure distributions and to a procedure for the determination of the undisturbed static pressure behind the impeller.