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The equation of state of detonation gas products is described by Ross's modification of hard-sphere variation theory and the improved one-fluid van der Waals mixture model. The Gibbs free energy of dissociated carbon is calculated for the most probable state, which is determined by distinguishing the following four states of carbon: graphite, diamond, graphitelike and diamondlike. The equilibrium compositions of detonation products are calculated by solving chemical equilibrium equations based on minimizing free energy. The detonation properties at CJ point of PETN explosives are calculated with this theory and the results show satisfactory agreement with the experimental data. We have also compared the adiabatic expansion from the CJ point calculated with the present theory and JWL equation. The adiabatic gamma decreases in the present theory but exhibits “double peak” in JWL equation. We suggest that “double peak” in JWL equation is made by the equation form itself and it doesn't correspond with actual physical process.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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