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Atomization and Sprays

Journal of the International Institutes for Liquid Atomization and Spray Systems

ISSN for PRINT: 1045-5110

Institutional price:	$787.00
Issues per year:	8

Best Paper Award Selection - Editorial Board Site

2003, Volume13

85 pages

Issue price - $75.00

A TECHNIQUE FOR DROP SIZE CONTROL DURING THROTTLING OF A ROCKET ENGINE

N. Jayan
Aerospace Engineering Department, Indian Institute of Science, Bangalore, India

B. N. Raghunandan
Department of Aerospace Engineering, Indian Institute of Science, Bangalore 560012, India

ABSTRACT

Experimental studies have been conducted on a new type of injector which can be used very advantageously in rocket engines designed for throttling applications. The aim is to keep the drop size constant for varying chamber pressures. The injector uses very small quantities of a gas to atomize a straight liquid jet before discharging into the combustion chamber. The concept is demonstrated over an eightfold variation of injector pressure drop. A feedback control system, which can regulate the air pressure with respect to the sensed chamber pressure, based on the input transfer function, so as to keep the drop size constant, is suggested. The transfer function is obtained from the experimental data. The major advantage of this injector is that it uses a very small quantity of gas, thereby limiting the weight penalty to a minimum. This system is much less complicated compared to variable area injector and cavitating venturi valves used for this purpose.