Preferred frequency oscillatory combustion of solid propellants

Eisel, J. L.; Horton, M. D.; Price, E. W.; Rice, Dale W.

doi:10.2514/3.2539

Cited by 24 publications

(5 citation statements)

References 5 publications

(2 reference statements)

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“…However, they also stated that charge size changes did not influence the frequency, and the plotted increase of frequency with pressure is so slight that it right easily be caused by more efficient combustioi! or higher gas temperature, Eisel (133) extended the original work of Angelus (124) to lower pressure, and found that the frequency of oscillation increased from 6 to 36 cps as the pressure increase from 0 to 80 psig. In this motor, there was no L* effect, since the pressure rise was controlled only by a bleed.…”

Section: The Coupling Of Pressure With a Distributed Flame Zonementioning

confidence: 85%

“…It is obvious, then, that several different mechanisms may be operating in the low pressure range, where the flame zone is distributed over an appreciable portion of the chamber volume, A partial explanation for the pressure-independent case may be that the combustion process may tend to oscillate at some characteristic frequency. For instance, Eisel et aL (133) found that the frequency data were correlated well by assuming that combustion produced a pulse with every surface recession of 90^/, Such a characteristic oscillation might become serious if there were a natural cavity mode to which it might couple.…”

Section: The Coupling Of Pressure With a Distributed Flame Zonementioning

confidence: 98%

See 1 more Smart Citation

Solid Propellant Combustion Instability: Oscillatory Burning of Solid Rocket Propellants

Waesche¹,

Summerfield²

1965

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Section: The Coupling Of Pressure With a Distributed Flame Zonementioning

confidence: 85%

Section: The Coupling Of Pressure With a Distributed Flame Zonementioning

confidence: 98%

Solid Propellant Combustion Instability: Oscillatory Burning of Solid Rocket Propellants

Waesche¹,

Summerfield²

1965

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“…Experiments with T burners of 20 m length have been reported. 5 At such great lengths, viscous damping and heat transfer cause a nonuniform temperature and velocity distribution, leading to less reliable results. At low frequencies therefore, one has to resort to other devices, such as the L* burner.…”

Section: Introductionmentioning

confidence: 99%

Helmholtz Resonator Burners: Analysis for Response Function Measurements

Schöyer

1982

Journal of Spacecraft and Rockets

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the velocity sensitivity by Doppler shift of an atomic emission line. The parameter block indicates the nesting level for the calibration loop and what interval and wavelength offset to use. The other special control function is a software servo to track an ultraviolet emission line over long periods of time. This is useful to compensate for temperature drifts of the instrument structure. The design of the instrument optics allows certain detector pairs to measure different portions of the same emission line. The servo software detects and compensates for the thermal drift by maintaining constant proportions of light measured by a detector pair. The fixed position of this function is immediately before the outer loop, which controls experiment repetition. Parallel OperationThe power consumption of the entire UVSP instrument was an important concern. Since the variable power consumption is a function of motor stepping rates, control of these rates was required. The step rate of the entire set of electromechanical functions is software limited by an end-off shift of an assigned memory word. The shift period of this word is set by a 16-ms clock interrupt. Each software device handler tests this word before commanding any device steps. If the value of the word is zero, the handler proceeds; otherwise it must wait for the timed shifts to clear the word. The word is set by each device handler to a value proportional to the device's load. While the interrupt routine continues to shift the power delay words, other software activities can proceed in parallel with this delay function.Another form of parallel functioning was applied to processing data from dual detector experiments. Velocity information can be calculated from these measurements, but it consumes a relatively large amount of time. A speedup of the measurement processing cycle was found necessary after launch. Since no computation is required during a light measurement interval, a portion of the computer's time was unused. This unused time was used by storing the data from a measurement until the next measurement interval when the calculations are performed. Interrupt SupportThe interrupt structure has three priority levels. The highest priority level is caused by a power fail detection circuit. It may not be locked out under any condition. The second level interrupt is associated with DMA operations. The software supports this level with a minimum of overhead. Interrupt level 3 is connected to a general purpose party line. The interrupt service software polls device addresses to identify the source. Possible sources are programmable timers, fixed period clocks, wavelength drive limit switches, day-night transition logic, and others.The software requires timing information to carry out the experiment control task. Two clock interrupts are used to supply most of the timing and synchronization information. The periods of these clocks are 16 and 64 ms. The longer period is used by the software mainly for data output synchronization. The 16-ms period matches the s...

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“…[81][82][83][84][85][86][87], oscillatory burning (Refs. [88][89][90][91][92][93][94][95][96][97][98][99][100][101][102][103][104][105][106][107], deflagration and low pressure extinction of ammonium oerchlorate (Refs. [108][109][110][111][112][113][114][115][116][117][118][119][120][121][122], low pressure extinction of composite propellants (Refs.…”

Section: -Background or The Research Studymentioning

confidence: 99%