ON REALIZATION OF ISOBARIC REGIMES OF ACTIVE MODIFICATION ON HIGH VELOCITY AIRFLOW AT INJECTION OF HEAVY AND COLD GASES

Results of computer simulation of active modification of a high speed air flow over a streamlined body are presented. Regimes with formation of isobaric regions of injected gases are considered. It is of interest to the engineers due to the prospects of its application for mitigation of energy consumption and emission of flue gases at high speed flights. The formation of the isobaric regimes was believed to require that the condition of the velocity of airflow being higher than the speed of sound of the injected gas is met, i.e. the injected gas is sufficiently light and hot. The temperature of the injected gas cannot be very high; it means that only helium and hydrogen could be used to meet this condition. However, these gases are to be stored under cryogenic conditions, which is not practical.

In this work, it is tested whether this sufficient condition is really necessary for formation of the isobaric regimes. Injection of comparatively cold and heavy gases with the speed of sound being 2–3 times less than the velocity of airflow is simulated. Besides the design mode of injection, low and high gas flow rates are studied. The excess gas flow increases the effective cross section of the body. If the flow rate is insufficient, the isobaric region covers only a part of the cross section of the body.

The main difference between the light and hot gases injection is that at injection of cold and heavy gases the flow kept very unstable during (70…100)∙t*, here t* is the characteristic period of flow along the body.

In all the cases considered, the isobaric regimes did appear. It makes it possible to apply much more sorts of gases for injection. 

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