Search Results

The results of computer simulation of a typical spacecraft pumped two-phase thermal control system are presented. The two-phase thermal control system transients under effect of the typical disturbances are obtained. The system dynamic characteristics are analyzed and influence of design parameters on the quality of system dynamic processes are discussed.

The article is devoted to the problems of joint optimization of mass, power and reliability characteristics of the thermal control system and radio electronic instruments for long term mission spacecraft of high reliability requirements. The instrument operation reliability depending mainly on cooling medium temperature, the problem of optimum temperature level choice in the thermal control system taking into account the maintenance of the reliability required is of great interest. The technique developed allows to choose the optimum instrument redundancy rate as well as the optimum temperature level in the thermal control system at minimum values of mass and power characteristics.

Presented are the technique, mathematical model and software for implementation of the optimal design of the radiators in terms of the criterion of the minimum total mass with the added mass of the power board system accounted for. The mathematical model takes into account the losses of pressure required for pumping the heat-transfer fluid through the hydraulic system of the radiator. The optimum values of the geometric parameters of the radiator and heat-transfer fluid flow rate are determined. The generalized geometric programming algorithm is used for optimization. Obtained are the results of solution as regards the radiators of the Orbital space station “MIR” research module. The recommendations covering reduction of the design mass of the radiators are disclosed. Both the technique the results can be used in design of other radiator systems of the space stations.

This paper deals with review of the issues associated with modelling the dynamic processes in the spacecraft two-phase thermal control systems. The work presents the results of modelling the nonstationary conditions of the evaporative and condensation heat exchangers functioning, investigates their response to the characteristic external influences. Disclosed are the results of the computer-aided modelling the two-phase thermal control system with a pump. The dynamic characteristics of the change in the inputs of pressures, temperatures and vapour content of a coolant in various branches of the system, as well as the lengths of the heat transfer zones in the evaporator and condenser under effect of the typical disturbing actions are obtained. The attained transients are analyzed.