Réponse des Propergols Sol ides aux Oscillations de Pression et de Vitesse

A facility for solid-propellant response measurements under pressure-driven conditions

“…One of the most important types of data is the thrust response function (R p ) under pressure-driven conditions, which is defined as the ratio of fluctuation of the mass flux rate (or burning rate) to fluctuations in pressure as follows: R p = m/m P /P (1) where m and P are instantaneous mass flux rate and pressure, respectively, and overbars indicate mean values. A variety of measurement methods have been developed and used for the measurement of the response function, including T-burner [2][3][4], rotating-valve apparatus [5,6], impedance tube [7], modulated throat-acoustic damping burner [8], microwave burner [9], magnetic flowmeter [10], and ultrasonic technique [11,12]. Of these methods, the T-burner method has a long history of use and significant theoretical analysis to support data interpretation.…”

“…However, it cannot measure the phase information (imaginary part: Im [R p ]) of the response function. Due to this limitation of the T-burner method, other methods [5][6][7][8][9][10][11][12] have been developed and evaluated as possible substitutes for the T-burner. Careful investigation and comparison of the earlier methods have revealed that each method had its own advantages and disadvantages, and no method has been found to be a perfect substitute [13].…”