TY - GEN
T1 - Aerodynamic drag measurement in a high-enthalpy shock tunnel
AU - Wang, Yunpeng
AU - Jiang, Zonglin
AU - Teng, Honghui
N1 - Publisher Copyright:
Copyright © 2018 ASME
PY - 2018
Y1 - 2018
N2 - A strain-gauge balance was used for measuring the aerodynamic drag in a high-enthalpy hypersonic shock tunnel with approximately 4 ms test time. The strain-gauge balances are in widespread used for the force measurement in conventional wind tunnel as a mature technology but seldom works in the shock tunnel or other impulse facilities. Because the drag balance is very difficult to design and use in a short-duration ground facility due to the low frequency vibrations of the MBS by the inertial force. In the present study, a high-stiffness PSGB used in the test shows good performance, wherein the frequency of the MBS system increases because of its stiff construction. Force tests were conducted for a cone with the 10◦ semivertex angle and a length of 375 mm. The FEM simulation and the hammer test were employed for the analysis of the vibrational characteristics of the MBS system to examine a sufficient number of cycles (the axial vibration frequency) during short test duration for the axial force signal. A design criterion is proposed for the balance's structure with higher frequency to ensure at least 2 circles in the balance signal during the effective test time. The structural performance of the present PSGB is in full compliance with the requirements of drag measurement during 4 ms. Therefore, the PSGB with optimized structure can be used for the force test in the short test duration hypersonic shock tunnel. The test results were analyzed to see the effect of high-temperature gas by comparing with the data obtained in nearly ten wind tunnels. Its standard deviation of the drag coefficient is small and the precision is less than 5%. Compared with the data obtained by the CFD and the theoretical analyses, the present drag coefficient increased by 9.476% and 30.67%, respectively. However, the detailed mechanism of the effects is still unclear, it is necessary to further study deeply. Additionally, in the future work, the capability of the current PSGB will be extended to three and six components.
AB - A strain-gauge balance was used for measuring the aerodynamic drag in a high-enthalpy hypersonic shock tunnel with approximately 4 ms test time. The strain-gauge balances are in widespread used for the force measurement in conventional wind tunnel as a mature technology but seldom works in the shock tunnel or other impulse facilities. Because the drag balance is very difficult to design and use in a short-duration ground facility due to the low frequency vibrations of the MBS by the inertial force. In the present study, a high-stiffness PSGB used in the test shows good performance, wherein the frequency of the MBS system increases because of its stiff construction. Force tests were conducted for a cone with the 10◦ semivertex angle and a length of 375 mm. The FEM simulation and the hammer test were employed for the analysis of the vibrational characteristics of the MBS system to examine a sufficient number of cycles (the axial vibration frequency) during short test duration for the axial force signal. A design criterion is proposed for the balance's structure with higher frequency to ensure at least 2 circles in the balance signal during the effective test time. The structural performance of the present PSGB is in full compliance with the requirements of drag measurement during 4 ms. Therefore, the PSGB with optimized structure can be used for the force test in the short test duration hypersonic shock tunnel. The test results were analyzed to see the effect of high-temperature gas by comparing with the data obtained in nearly ten wind tunnels. Its standard deviation of the drag coefficient is small and the precision is less than 5%. Compared with the data obtained by the CFD and the theoretical analyses, the present drag coefficient increased by 9.476% and 30.67%, respectively. However, the detailed mechanism of the effects is still unclear, it is necessary to further study deeply. Additionally, in the future work, the capability of the current PSGB will be extended to three and six components.
UR - http://www.scopus.com/inward/record.url?scp=85056162510&partnerID=8YFLogxK
U2 - 10.1115/FEDSM2018-83021
DO - 10.1115/FEDSM2018-83021
M3 - Conference contribution
AN - SCOPUS:85056162510
T3 - American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM
BT - Development and Applications in Computational Fluid Dynamics; Industrial and Environmental Applications of Fluid Mechanics; Fluid Measurement and Instrumentation; Cavitation and Phase Change
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting, FEDSM 2018
Y2 - 15 July 2018 through 20 July 2018
ER -