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Pulse-echo measurements of unsteady propellant deflagration
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10.1063/1.1938252
/content/aip/journal/rsi/76/6/10.1063/1.1938252
http://aip.metastore.ingenta.com/content/aip/journal/rsi/76/6/10.1063/1.1938252

Figures

Image of FIG. 1.
FIG. 1.

Experimental apparatus showing the motor with the pressure-modulation apparatus above and the ultrasonic transducer connected below. The transducers monitoring chamber pressure can be seen attached to the motor midsection. The motor exhausts upward.

Image of FIG. 2.
FIG. 2.

Propellant sample ready for testing. A layer of epoxy is cast around the sample to prevent lateral burning.

Image of FIG. 3.
FIG. 3.

Schematic of the major system components.

Image of FIG. 4.
FIG. 4.

Correspondence between the sample geometry and the pulse-echo ultrasonic wavelet. From left to right, the first set of wavelets (1) is the signal from the transducer. The second set (2) is the echo from the back of the transducer. The third set (3) is the echo from the coupling/sample interface. The fourth set (4) is the echo from the sample surface. The purpose of the coupling material is to protect the transducer from the hot, corrosive gases and delay the return of the propellant surface echo (4) so that it can be discerned from the input wavelet (1).

Image of FIG. 5.
FIG. 5.

Cross section of the vented combustion vessel with attached propellant sample holder, ultrasonic transducer, and fluidic valve.

Image of FIG. 6.
FIG. 6.

Pretest (a) and post-test (b) calibration data showing the echo time for the propellant/coupling assembly and the echo time for the coupling material alone as a function of pressure.

Image of FIG. 7.
FIG. 7.

Example output voltages from all transducers during the 17 Hz (a) and 70 Hz (b) experiments.

Image of FIG. 8.
FIG. 8.

Chamber pressure for the 17 Hz (top) and 70 Hz (bottom) experiments.

Image of FIG. 9.
FIG. 9.

Detrended ultrasonic signal for the 17 Hz (top) and 70 Hz (bottom) experiments. Superimposed in gray are the low pass filtered signals.

Image of FIG. 10.
FIG. 10.

Burn rates for the 17 Hz (top) and 70 Hz (bottom) experiments.

Tables

Generic image for table
Table I.

Propellant formulations and physical characteristics

Generic image for table
Table II.

Summary of input and output data from the example tests.

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/content/aip/journal/rsi/76/6/10.1063/1.1938252
2005-06-10
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Pulse-echo measurements of unsteady propellant deflagration
http://aip.metastore.ingenta.com/content/aip/journal/rsi/76/6/10.1063/1.1938252
10.1063/1.1938252
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