The thermal state of a porous wall under conditions of transpiration cooling

Abstract

Results of numerical experiment are used for analysis of fields of temperature in a laminar boundary layer, in a porous wall, and in a cooling gas delivery chamber, as well as for analysis of heat transfer and of distribution of the temperature difference between the cooling gas and the porous wall frame and cooling efficiency. It is demonstrated that heat transfer between a porous wall of finite thickness and a hightemperature gas flow differs significantly from heat transfer with preassignment of the same intensity of injection and of the homogeneous thermal boundary condition directly on the surface subjected to flow. One of the reasons for this is the formation of wall temperature variable along the boundary layer.

The thermal state and the heat transfer in a porous metal shell upon penetration cooling

“…3). The temperature distribution pattern in a porous wall [11] is similar to that shown in Fig. 2, but the difference in the temperatures of the skeleton and of the cooling gas on the plate's surface is considerably smaller than it is in Fig.…”

“…Let us compare the obtained results with the data reported in [9][10][11] on the conditions for the external heat input from the high temperature gas that is implemented in the penetration cooling system.…”

“…In [11], numerical study of the velocity, temperature, and heat transfer fields in the systems such as a high temperature laminar boundary layer, a porous plate, and Nu the region of the cooling gas supply was carried out using the ANES/NE software complex. A 0.3 mm thick porous plate consisting of globules 0.2 mm in diameter has the permeability index K = 4 × 10 -11 m 2 .…”