The local and integral characteristics of three-dimensional boundary layer were investigated in a large scale turbine blade cascade. The flow visualization was carried out for preliminary analysis of the flow structure on the endwall of a blade channel. Then the distribution of velocity components and flow angles in three-dimensional boundary layers was measured in detail. On the basis of the investigation results the generalized equations for calculation of boundary layer characteristics were determined.
Present study deals with experimental and theoretical performance analysis of an inert gas generator(IGG) which can be used as an effective mean to suppress the fire. The system consists of a gas turbine engine and afterburning system with injection of water, exit nozzle to produce the inert gas. It is generally known that the degree of oxygen content in the product of combustion depends on both inlet and outlet temperature of a combustor. Less the oxygen content in the combustion product higher will be the effectiveness of fire suppression. Injection of water brings additional advantages of suffocating and cooling effects which are both indespensable factors for fire suppressing. The special test rig was manufactured and experimental investigation of IGG system has been carried out. The automatic control system ensured stable operation of gas turbine engine and afterburner, water injection, fuel control and others. During the investigation the main parameters of gas turbine engine and auxiliarly systems were measured: gas temperature and pressure at gas turbine and afterburner exit, fuel flow rate, water mass flow rate, inlet air temperature, water temperature in the cooling chamber, mass flow rate, temperature and velocity of exhaust gas-steam mixture in the exit nozzle, oxygen content in the exit jet. The experimental investigation shows that developed IGG system can work very well for indoor fires but need some modifications in application to outdoor fire suppressing.
Aerodynamic losses and local heat transfer coefficients on the streamlined surface depend on the length of laminar, transition and turbulent boundary layer on this surface. In real conditions many factors influence on the development of boundary layer. Therefore the investigations of laminar-turbulent transition were carried out at combined action of longitudinal pressure gradient, Reynolds number, external flow turbulence intensity, temperature factor, curvature and roughness of streamlined surface. The regularities of boundary layer development and its characteristics in the laminar and transition zones were determined.
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