A novel calibration algorithm for five-hole pressure probe

Abstract

Five-hole pneumatic pressure probes are used to carry out the steady-state measurements of three components of velocity, inflow angles, static and total pressures simultaneously for a point in a flow field. Various calibration algorithms for five-hole probes are studied in this paper as reported in the literature. Authors have defined non-dimensional pressure coefficients in different ways. Based on certain limitations, a new set of pressure coefficients are proposed in this paper, which overcome the limitations in the literature and gives less computational errors in calculating the flow parameters. In this method, the influence of pressure recorded by central hole (5 P) is considered in defining these coefficients. From 4th order regression analysis, the average values of 2 r parameters for all zones are 0.9979 and 0.9910 for α and β respectively, and which are even better than that reported in the all existing methods