Obtekanie Krylovogo Profilia Pri Dokriticheskoi Skorosti Potoka

"The use of the linearized equations of Chaplygin to calculate the subsonic flow of a gas permits solving the problem of the flow about a wing profile for absence and presence of circulation. The solution is obtained in a practical convenient form that permits finding all the required magnitudes for the gas flow (lift, lift moment velocity distribution over the profile, and critical Mach number). This solution is not expressed in simple closed form; for a certain simplifying assumption, however, the equations of Chaplygin can be reduced to equations with constant coefficients, and solutions are obtained by using only the mathematical apparatus of the theory of functions of a complex variable" (p. 1)

Subsonic Gas Flow Past A Wing Profile

The use of the linearized equations of Chaplygin to calculate the subsonic flow of a gas permits solving the problem of the flow about a wing profile for absence and presence of circulation. The solution is obtained in a practical convenient form that permits finding all the required magnitudes for the gas flow (lift, lift moment velocity distribution over the profile, and critical Mach number). This solution is not expressed in simple closed form; for a certain simplifying assumption, however, the equations of Chaplygin can be reduced to equations with constant coefficients, and solutions are obtained by using only the mathematical apparatus of the theory of functions of a complex variable. The method for simplifying the equations was pointed out by Chaplygin himself. These applied similar equations to the solution of the flow problem and obtained a solution for the case of the absence of circulation

Steam-gas power stations with multi-stage residual-oil combustion

This paper describes a method for the multi-stage combustion of high-sulphur residual fuel oils in thermal power stations which ensures minimum contamination of the atmosphere. In the first stage of combustion, high-pressure steam and fuel gas are produced. The latter is cooled and freed of ash and sulphur compounds. The steam and the purified gas are then used for power generation. The method gives a high rate of sulphur removal and considerable reduction of nitrogen oxide emission. This new power station concept employs gas turbines and steam/gas turbines to achieve the optimal use of energy. A discussion of technical and economic aspects concludes the paper.