A heat storage element for high-flow, high-temperature, high-pressure, and high-speed gas environments

Abstract

The invention belongs to the technical field of hypersonic wind tunnel test equipment, and discloses a thermal storage element used in a high-flow, high-temperature, high-pressure, and high-speed gas environment. The heat storage element is a metal element stacked in layers in the regenerative heater for heat storage, including a basic body and a matching block. The basic body is layered and filled in the center of the inner liner of the heat storage heater The cavity is a square grid body arranged in an array on each layer, and the matching block is a matching grid body corresponding to the basic type body and suitable for filling the edge of the inner liner of the regenerative heater; the basic type body and the matching block The body is processed with gaps that face the incoming flow and penetrate up and down. The gap ratio of the heat storage element is 0.33; the weight of each basic body and matching block is greater than or equal to the buoyancy it receives in the flow field. The thermal storage element does not move, does not drop slag, does not float up, and is easy to disassemble, install and fix, which ensures the reliability of the thermal storage heater, improves the cleanliness of the test air flow, and the quality and efficiency of the wind tunnel test.

Description

technical field [0001] The invention belongs to the field of hypersonic wind tunnel test equipment, and in particular relates to a heat storage element used in a high-flow, high-temperature, high-pressure, and high-speed gas environment. Background technique [0002] In a conventional hypersonic wind tunnel using air as the test medium, due to the extremely high gas flow velocity, reaching Mach number 5 to Mach number 10, the violent expansion of the gas flow through the nozzle will cause water vapor and carbon dioxide to condense, resulting in irregularities in the flow field. The uniformity makes the test data inaccurate, which is not allowed in the hypersonic wind tunnel aerodynamic test. Therefore, in a conventional hypersonic wind tunnel with a large flow of high-speed air as the medium, it is necessary to install a regenerative heater to heat the airflow to the required anti-condensation temperature. Since the main purpose of the hypersonic wind tunnel is to carry out...

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Problems solved by technology

[0006] The pebble bed heat storage element has the following disadvantages: a. The contact area between the heat storage ball and the electric heating element is small, and the heat transfer efficiency is low, resulting in a low heating rate of the heat storage ball, long preheating time, and the electric heating element Local over-temperature damage affects the reliability of the heating element and the efficiency of the wind tunnel test; b. The heat storage balls are naturally stacked in the container. Under the long-term repeated thermal expansion and contraction conditions, the small balls will move and squeeze irregularly. And generate a large stress, resulting in deformation or even damage to the lining cylinder and the electric heating element, reducing the reliability of the electric heating element; c. The heat storage ball is a ceramic ball, which is easy to drop slag. The slag is more serious, will pollute the test airflow, have a sandblasting effect on the test model, and affect the accuracy of the test data; d. The hot balls are easy to float up under the action of buoyancy, which may damage the electrical connection and downstream equipment in the upper head, and affect the safety of the wind tunnel operation; , It is inconvenient to disassemble, and it cannot fix the heating element, which will cause the heating element to shift and tilt, and affect the reliability of the heating element and the efficiency of the wind tunnel test

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