Supersonic plasma flow critical heat release

Figure 5- 1. Gasdynamic characteristics of a plasma-chemical discharge in supersonic flow (1) discharge inlet temperature Ti, (2) initial tank pressure poii (3) exit pressure po3 in the conditions of critical heat release (4) critical heat release q. All the parameters (1 ) are shown as functions of Mach number Mi in front of the discharge. Initial gas tank temperature Too = 300 K static pressure infrontofdischarge Pi = 0.1 atm.

A decrease of energy efficiency at higher values of the specific energy input is due to overheating and as a result of acceleration of VT relaxatioa Serious restrictions of the specific energy input in supersonic plasma systems are also related to the critical heat release and choking of the flow. 

Limitations of Specific Energy Input and CO2 Conversion Degree in Supersonic Plasma Related to Critical Heat Release and Choking the Flow... 

The specific energy input and conversion degree are limited in supersonic plasma reactors by the critical heat release, which corresponds to a drop of the initial Mach number from M > 1 before the discharge to M = 1 afterward and leads to choking of the supersonic flow. The critical heat release for the supersonic reactor with constant cross section is equal to... 

Here Too is the initial gas temperature in the tank before the supersonic nozzle. If the initial Mach number is not very close to unity, the critical heat release can be estimated as g cr CpToo. Numerical values of the critical heat release at different initial Mach numbers for the supersonic CO2 flow can also be found in Fig. 5 1. Further increase of the heat release in plasma over the critical value leads to the formation of non-steady-state flow perturbations like shock waves, which do no good to a non-equilibrium plasma-chemical system. Even taking into account the high energy efficiency of chemical reactions in supersonic flows, the critical heat release seriously restricts the specific energy input ... 

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See also in sourсe #XX -- [ ]

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