Influence of Injecting the Gasification Products of the Thermal Protection Coating of the SRE Nozzle Recessed Part on the Specific Impulse Losses

Abstract

The paper analyzes the process of thermochemical interaction of the combustion and decomposition products of the thermal protection coatings based on the phenol-formaldehyde resin in the homogeneous approximation. The thermal protection coating decomposition products are injected from the nozzle subsonic section contour. The decomposition products amount is determined by solving the conjugate gas-dynamic flow problem taking into account the kinetic interaction mechanisms and heat fluxes according to the Bartz model. The paper compares results of combustion computation using kinetic mechanisms of the ammonium perchlorate and polybutadiene rubber combustion with a variable formulation and in the thermodynamic equilibrium. It provides boundary conditions for homogeneous approximation of the solid fuel combustion with a simplified representation of the heat balance between solid, liquid and gas phases. Estimates of chemical transformations in the nozzle expanding part are considered in the one-dimensional and axisymmetric approximations. Thermochemical losses along the supersonic section of the nozzle are demonstrated taking into account decomposition of the thermal protection coating. The paper presents specific impulse losses with the CH₄, CO, CO₂ and H₂ injection into the minimum cross-section in quantities of 0.01; 0.1 and 1 % of the gas inlet from the solid fuel surface without taking into account the stagnation temperature alteration to the minimum cross-section. The nature of the solid propellant rocket motor thrust alteration is determined with a correction for losses due to injection of the decomposition products of the thermal protection coating from the nozzle subsonic surface. The relationship is determined between the flow rate coefficient and the energy loss in the boundary layer

Please cite this article in English as:

Shaydullin R.A., Sabirzyanov A.N. Influence of injecting the gasification products of the thermal protection coating of the SRE nozzle recessed part on the specific impulse losses. Herald of the Bauman Moscow State Technical University, Series Mechanical Engineering, 2025, no. 1 (152), pp. 59--82 (in Russ.). EDN: TPIUHM

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