Impact of sensor housing geometries onto transient stagnation pressure measurements in supersonic flows

In the present study, we investigate the characteristic behavior of two different housing geometries for pressure sensors in supersonic flows. Pressure sensors shielded with conical and flat shrouds are positioned radially along the cross section in a shock tube and intended to measure the stagnation pressure of the post-shock flow. The rise time, the oscillating behavior and the absolute value of the signals are compared. Results indicate that pressure measured for both housing geometries experiences oscillations to some extent and settles down at the expected value in the end. However, the signal for the sensor with the conical shroud oscillates at a much larger amplitude through a significantly longer settling time. Numerical simulations are used to support the analysis of the recorded results and to explain internal flow phenomena. Furthermore, we will describe the ongoing experiments visualizing the flow field around the sensor housing using high-speed schlieren photography. Also introduced are the projected experiments concerning the specific sensitivity of the housing geometries to manufacturing tolerances, mounting errors like misalignment to the flow direction and measures to reduce the signal rise time by filling cavities with grease.     «

In the present study, we investigate the characteristic behavior of two different housing geometries for pressure sensors in supersonic flows. Pressure sensors shielded with conical and flat shrouds are positioned radially along the cross section in a shock tube and intended to measure the stagnation pressure of the post-shock flow. The rise time, the oscillating behavior and the absolute value of the signals are compared. Results indicate that pressure measured for both housing geometries exper...     »