TY - JOUR
T1 - Impact of sensor housing geometries on transient stagnation pressure measurements in impulse facilities
AU - Wang, Zhaoguang
AU - Giglmaier, Marcus
AU - Hopfes, Thomas
AU - Köglmeier, Lea
AU - Adams, Nikolaus A.
N1 - Publisher Copyright:
© 2019 Elsevier Inc.
PY - 2019/12
Y1 - 2019/12
N2 - The measurement of transient stagnation pressure in impulse facilities, such as shock tubes and expansion tubes, is critical due to the limited experimental time window. In the present study, we investigate the characteristic behavior of pressure sensors shielded by blunt and conical housings, and evaluate the specific influence of the housing dimensions on the stagnation pressure measurement in distinct flow conditions. Pressure signals of piezoelectric sensors were acquired and schlieren images visualizing the wave dynamics were recorded. We conducted additional numerical simulations to support our hypotheses concerning the flow inside the housings. Results indicate that the pressure signal for conical housings exhibits longer rise time and more pronounced oscillations compared to that for blunt housings. Enlarging the borehole diameter and reducing the cavity depth both shorten signal rise time but enhance overshoots. Additional experiments on the sensitivity to assembly misalignment, the effect of gelatin-filled housings and the performance of exposed sensors complete the study.
AB - The measurement of transient stagnation pressure in impulse facilities, such as shock tubes and expansion tubes, is critical due to the limited experimental time window. In the present study, we investigate the characteristic behavior of pressure sensors shielded by blunt and conical housings, and evaluate the specific influence of the housing dimensions on the stagnation pressure measurement in distinct flow conditions. Pressure signals of piezoelectric sensors were acquired and schlieren images visualizing the wave dynamics were recorded. We conducted additional numerical simulations to support our hypotheses concerning the flow inside the housings. Results indicate that the pressure signal for conical housings exhibits longer rise time and more pronounced oscillations compared to that for blunt housings. Enlarging the borehole diameter and reducing the cavity depth both shorten signal rise time but enhance overshoots. Additional experiments on the sensitivity to assembly misalignment, the effect of gelatin-filled housings and the performance of exposed sensors complete the study.
UR - http://www.scopus.com/inward/record.url?scp=85068255123&partnerID=8YFLogxK
U2 - 10.1016/j.expthermflusci.2019.109851
DO - 10.1016/j.expthermflusci.2019.109851
M3 - Article
AN - SCOPUS:85068255123
SN - 0894-1777
VL - 109
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
M1 - 109851
ER -