SU1657989A1 - Gas-speed high-temperature head for full pressure - Google Patents

Abstract

The invention relates to a measurement technique and coins to be used to measure the total pressures in the all-temperature gas or plasma streams. The purpose of the invention is to increase the work resource. The nozzle contains a bent receiving tube 2 of heat-resistant steel installed in a holder, on the end of which a flange 3 is installed in the form of a hemisphere. The receiving tube 2 is placed in a curved body 4, the shape of which is identical to the shape of the tube. At the sealed end of the housing 4, a fitting 6 is welded into its wall, which serves to connect the internal cavity of the housing 4 to a high pressure source. The flange 3 is made of heat-conducting material. After inserting the nozzle into the high-temperature gas flow, the spherical elements 7 strung on the receiving tube 2 begin to melt, stabilizing the temperature of the flange 3 and the entire body 4 of the nozzle. The melt of the elements 7 through the holes 9 is withdrawn into the gas stream and carried away with them. Under the action of the piston 8, the spherical elements 7 are moved to the flange 3. 1 p. Of f-ly, 1 sludge. with te SL

Description

The invention relates to a measuring technique and can be used to measure the total pressures in high-temperature gas or plasma flows, for example, in working flows of aerodynamic installations with electric arc gas heating.

The purpose of the invention is to increase the work resource.

The drawing shows the proposed attachments, a general view "

Nozzles contains an installed

in derpatel 1 (for example, in the holder of the working part of the wind tunnel) receiving tube 2, at the end of which is fixed a flange 3, made, for example, in the form of a hemisphere. The fastening of the flange of the 3 coins can be carried out using a threaded joint or welding. As the material of the receiving tube 2, refractory steel can be used. The tail 3 is advisable to be made of a material with a high thermal conductivity, such as copper. The receiving tube 2 is enclosed in a housing 4 made of heat-resistant steel. In the drawing, body 4 is bent at a right angle, however, it may be bent at other angles or bent into a spiral. The receiving tube 2 must be identical in shape to the shape of the body. Case 4 contacts

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with

with flange 3. Their connection can be made by screwing or welding. At the other end of the housing 4, there is a seal 5 with a hole for receiving the receiving tube 2, which serves to seal the inner cavity of the housing 4. At the sealed end of the housing 4, a fitting 6 is welded into its wall, which serves to connect the internal cavity 4 to the source during measurements. high pressure gas (not shown). Balls 7 with a hole, made of an ich material with a lower melting point, for example aluminum, than the material of the receiving tube 2 and the flange 3, are strung onto the receiving tube 2. The diameter of the elements 7. as well as the size and shape of the holes are chosen so that they are chosen so that the elements 7 can freely move along the receiving tube 2 inside the body 4, without being jammed at the bend of the tube and body. Thus, it is advisable to make the holes in the elements 7 expandable (see drawing). For pressing the ball elements 7 to the flange 3, a sealed piston 8 is used, which can be made of metal with grooves to accommodate sealing (rubber) rings. It can also be entirely made of rubber. The piston 8, as well as the ball elements 7, when assembling the nozzle is strung on the receiving tube 2. During the measurements, in the contact zone of the housing 4 with the flange 3, holes 9 are made in the process of measuring the melt of the heat-removing ball element 7 a device 10, for example, a pressure sensor connected to the receiving tube 2. The holder 1 is cooled by water flowing through the channels 11.

Nozzles works as follows.

After complete assembly, the nozzle is installed in the holder and the gun 6 is connected to a high pressure source. In this case, the piston 8 with the internal cavity of the housing 4 forms a pneumatic exciter transmitting the force to the spherical elements 7. The nozzles are introduced into the controlled working flow of gas or plasma. In Reeul, 10

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6579894

Claims (1)

At the flange heating point, 3 ball elements begin to melt, stabilizing the temperature of both the flange and the entire nozzle body. The melt of the elements 7 through the holes 9 is withdrawn into the gas stream and carried away with them. Under the action of the piston 8, the ball elements 7 move to the flange, with some of the elements playing the role of a flexible pusher, and a friend - a heat-removing element. Due to the fact that the housing 4 is curved, its length is not limited by the size of the working part of the aerodynamic installation, which allows it to accommodate a large number of heat removal elements and thereby significantly increase the life of the nozzle. Invention Formula Nozzles of full pressure of high-temperature flows, containing a receiving tube installed in a holder made of heat-resistant material with a flange fixed at one of its ends, a heat removal element made of a material with a melting temperature lower than that of the material of the receiving tube and mounted with the possibility of moving along its axis, and a mechanism for pressing the heat removal element to the flange, characterized in that, in order to increase the service life, it is provided with a curved tubular body of heat-resistant material, one end The center of which is fixed on the flange, and the other one is equipped with a sealing cap with a hole in which the free end of the receiving tube is placed, the receiving tube having the form identical to the shape of the tubular body and installed coaxially with it, and the heat removal element is designed as a set of ball elements the central holes in which the receiving tube is placed, whereby the spherical elements are installed along the tube, and the mechanism of pressing the heat-removing element to the flange is made in the form of a sealing ring piston placed ezhdu reception tube and the housing, and connections for connecting the interior of the housing to a high pressure source, wherein the connector is fixed on the housing between the sealing cover and the annular piston, and on the end of the housing, secured on the flange, provided with radial openings. thirty 35 40 45 50 55