Browning, Frank H. (1947) Conditions for choking in a cylindrical combustion chamber with eddying pressure losses. Engineer's thesis, California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-12112008-111809
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Choking occurs in a cylindrical combustion chamber when the gas reaches sonic velocity at the outlet, and no more fuel can be burned without causing unstable combustion and possibly "blowout" of the flame. In this analysis, the conditions for choking and the maximum possible fuel-air ratio for given inlet conditions are determined by a trial and error method, which proves to give accuracy within about 1/2 percent. Entering Fig. 13, 14, or 15 with the given inlet conditions, the fuel- air ratio for choking [(...)] is determined. From Fig. 16, 17, or 18, the temperature of the gas at the outlet is determined. Then [...] can be found from Fig. 1, 2, or 3, and the pressure and density of the gas at the outlet from equations (12) and (13).
If [...] is assumed to remain constant over the temperature range involved, and constant with respect to change in the gas composition due to combustion, then it is possible to solve algebraicly for the conditions for choking. This approximation is reasonably valid for small fuel-air ratios, but may cause errors of over ten percent when the inlet temperature is low and the fuel-air ratio is high.
|Item Type:||Thesis (Engineer's thesis)|
|Degree Grantor:||California Institute of Technology|
|Division:||Engineering and Applied Science|
|Thesis Availability:||Public (worldwide access)|
|Defense Date:||1 June 1946|
|Default Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Imported from ETD-db|
|Deposited On:||08 Jan 2009|
|Last Modified:||26 Dec 2012 03:13|
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