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Overall design and assessment method for hollow brick heat storage type heater

A heater and regenerative technology, applied in design optimization/simulation, instrumentation, calculation, etc.

Inactive Publication Date: 2018-09-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Up to now, there is no complete and detailed evaluation method for the overall design of hollow brick type regenerative heaters in China

Method used

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  • Overall design and assessment method for hollow brick heat storage type heater
  • Overall design and assessment method for hollow brick heat storage type heater
  • Overall design and assessment method for hollow brick heat storage type heater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] This embodiment provides a design and performance evaluation method for a heat storage unit of a hollow brick heater.

[0062] The basic design state requirements for the design of the hollow brick type regenerative heater in the embodiment are: air flow rate 3.0kg / s, simulated total temperature 2200K, simulated total pressure 5.0MPa, and effective running time of at least 50 seconds. Table 1 shows the geometric parameters of the heat storage unit in the design scheme and the related parameters calculated by this method. High-purity alumina bricks and zirconia bricks are used as heat storage materials. The alumina material is arranged in the lower temperature area (below 1900K) of the heater, and the zirconia material is arranged in the higher temperature area (1900K-2400K) of the upper part of the heater to meet the heating demand of the airflow temperature of 2200K.

[0063] Based on the geometric parameters of the hollow brick heat storage unit and the material char...

Embodiment 2

[0076] This embodiment is a checking method for the heat insulation layer. against Figure 8 This cylindrical insulation structure arrangement is checked and calculated. It is known that from the inside to the outside, each layer is heat storage unit, high temperature thermal lining, inner ring heat insulation layer, outer ring heat insulation layer, stainless steel shell, and the diameters of each layer are as follows: D1=450mm, D2=650mm, D3 =850mm, D4=1050, D5=1150mm. Using the one-dimensional steady-state heat conduction relationship of multi-layer cylinder insulation for verification, it can be determined that the heat loss power per unit height of the straight cylinder section in the middle of the heater is:

[0077]

[0078] The outer surface temperature of each layer is:

[0079]

[0080] Hot surface temperature (that is, the temperature of the outer surface of the heat storage unit) T in According to two calculations of = 2400K (high temperature section) and ...

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Abstract

The invention discloses a design and assessment method for a hollow brick heat storage type heater. The method comprises the steps of (1) performing geometric design of a heat storage unit of the heater; (2) performing a performance analysis method for the heat storage unit, wherein the performance analysis method for the heat storage unit includes a pressure loss analysis method and a heat stressanalysis method for the heat storage unit; (3) performing design and analysis method for a heat insulation layer of the heater; and (4) performing a preliminary preheating design and analysis methodfor the heater. According to given benchmark design state requirements of the heater, geometric design of a heater scheme can be performed by adopting the method, wherein the geometric design comprises operation of determining other geometric parameters such as the total height and the maximum diameter of the heater, the height and the diameter of a heat storage material, the thickness of the heatinsulation layer and the like; and aerodynamic parameters in a working process of the heat storage type heater can be further assessed by adopting the method, namely, calculation can be performed toobtain an airflow mass flux characteristic of the heat storage unit under a benchmark condition, an on-way change of a local maximum temperature difference of the heat storage unit in a benchmark operation state, radial temperature distribution of a heat storage array in a preheating process and the like.

Description

technical field [0001] The invention relates to the technical design field of scramjet engine ground experiments, in particular to a design evaluation method for scramjet combustion chamber experiment system of pure air hollow brick regenerative heating. Background technique [0002] At present, the development and application of regenerative heaters abroad are mainly concentrated in the United States (such as NASA, ASE and AEDC), France and Japan (NAL). So far, more than 30 sets of regenerative heating systems have been developed abroad, among which the typical ones are the 9# wind tunnel of the American AEDC, the hypersonic wind tunnel equipment HTF of the NASA Green Research Center, the RJTF of the Japanese Defense Agency Research and Development Bureau, The S4 wind tunnel of the French Space Agency, etc. At present, there is no hollow brick regenerative heater for hypersonic wind tunnels in China. In 1998, Dalian Beidao Energy Technology Co., Ltd. realized the applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/20
Inventor 李建平焦贵谦陈亮宋文艳金荣嘉吴品鑫陈龙
Owner NORTHWESTERN POLYTECHNICAL UNIV
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