The velocity of a subsonic flow of gas increases where the nozzle constriction occurs, as the mass flow rate remains constant throughout. The performance of the Delaval nozzle is dependent on the fact that hot exhaust gases have different properties depending on their speed regime, that is subsonic or supersonic. Rather than answer by trying to find tables showing the results of different ratios, angles and scaling effects, if instead you use the Aerorocket program, it seems to provide a large range of options to try out the performance of the nozzle, by adjusting the parameters you have listed in your question. This answer is taken from Aerorocket, which is a DeLaval nozzle analysis program and Wikipedia Delaval Nozzle
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