Hydrocarbon fuel is used as coolant to cool scramjet by flowing through cooling
channels at atmospheric pressure and quasi-critical pressure conditions. The
instability of the heat transfer will occur in this process. However, the
effect of scramjet vibration on the heat transfer instability is unclear. In
order to study the effect of cooling channel forced vibration on the
unstable heat transfer performance at trans-crtical pressure, cooling
channel heat transfer characteristics under different vibration condition
are analyzed. Experimental results show that at atmospheric pressure, cooling
channel vibration causes a drastic change in the temperature of the inner
wall during unstable heat transfer process, but vibration will not change
the fuel bulk temperature oscillation process. As a result, forced vibration
can lead to heat transfer deterioration in the gas-liquid two-phase flow. Under
the condition of quasi-critical pressure, cooling channel vibration not only
change the inner wall temperature, but also influence the fuel bulk
temperature. The forced vibration can lead to heat transfer enhancement.
High frequency vibration can effectively suppress heat transfer instability
and reduces heat transfer fluctuations.