Regulating altitude characteristic of nozzle with the large degree of expansion

Aerospace propulsion engineering


Semenov V. V.

Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia



The way of essential increase of an overall performance of a high-altitude nozzle in terrestrial conditions is offered by variation of its expansion ratio at the expense of a ring slot on a supersonic part. The results of slot-hole tests at a differential installation on overexpansion modes are resulted. It is shown, that the results of fire tests of a slot-hole nozzle coincide well with the experimental data received at its cold purges by compressed air. The optimum sizes of a ring slot and its site on a supersonic part of the round nozzle are determined. It is established, that at organization of several ring slots in a supersonic part of the high-altitude nozzle the range of change of external pressure, at which the positive effect is kept, considerably extends.

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