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How long should the combustion chamber be on a potato gun? 

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The simulation results also indicate that the stable combustion in a micro-scaled chamber may be sustained through increasing the ratio of flow residence time in chamber to chemical reaction time, and maintaining proper thermal condition.
Ignition delay results show good agreement with previous measurements by other investigators performed in a constant volume combustion chamber.
On the basis of the calculated results, it is evident that, in order to obtain maximum gas velocity and temperature, the nitrogen flow rate should be kept to a minimum, provided that particles can be delivered to the gun in a smooth manner.
The results show that the combustion is sustained in the chamber, as evidenced by the flame temperature.
The results showed that start of combustion delayed by n-butanol addition, so direct injection timing should be retarded to keep constant the combustion phasing.
It is shown that this tool not only predicts the change of combustion regime as a function of the ST, but it also roughly succeeds in predicting the location and time of appearance of the DDT in the chamber.
This study further verified the feasibility of triggering the CRDW in a unique hollow combustion chamber through annular injection distribution.
The results obtained in the study provide assistance in the design of combustion chamber shape in order to avoid piston destroyed by the pressure waves.
Further accurate understanding of the interaction of the combustion events between the chambers and the gas exchange process can lead to optimum pre-chamber design and operation, and enable system scalability.
Tests with the model chamber, based on the suggested scaling method, are far more cost-effective than with the actual (full-scale) chamber and useful for injector screening at the initial stage of the combustor development in a viewpoint of combustion instabilities.