The constant pressure time in a piston driver of free piston shock tunnel
- Paper number
IAC-13,C4,9,4,x18796
- Author
Dr. Zhu Hao, China Academy of Aerospace Aerodynamics(CAAA), China
- Year
2013
- Abstract
The free piston shock tunnel is one of high-enthalpy ground facilities for hypersonic test, however the useful test time of this kind tunnel is very short. The piston compressor is one of the kernel parts in the free piston shock tunnel. The tunnel’s driven power is just ensured by the performance of the piston compressor. In 1960s, Stalker started the theoretical investigation on the piston compressor and developed the relative engineering practice. Increasing the constant-pressure time of piston driver can be seen as one of the available approach to extend the useful test time of the free piston shock tunnel. For this reason, the relation of the piston velocity and the constant-pressure time in the piston driver has been researched in the present paper. For the convenience of the theoretical investigation, the free piston shock tunnel is simplified as Stalker tube. The results reveal that the constant-pressure time have local maximums about velocity of piston, with different initial parameters and these local maximums form a ridge curve. Subsequently, the elaborate properties of this ridge curve provides are obtained by numerical analysis. It is shown that the optimal or suboptimal design points of this tunnel should close to the ridge curve, and its gradient of constant-pressure time is small.
- Abstract document
- Manuscript document
(absent)