Method for theoretically predicting burning rate of water ramjet with high metal content

A technology of engine and water stamping, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc.

Active Publication Date: 2018-07-20
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

Existing solid fuel burning rate calculation methods are usually based on a large number of burning rate test data to fit the burning rate coefficient and pressure index, and use the Vieri empirical formula with the combustion chamber pressure as the characteristic variable to describe the burning rate. This "from experiment to model" The technical route is not suitable for high metal content water ramjet engines

Method used

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  • Method for theoretically predicting burning rate of water ramjet with high metal content
  • Method for theoretically predicting burning rate of water ramjet with high metal content
  • Method for theoretically predicting burning rate of water ramjet with high metal content

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Embodiment 1

[0073] A theoretical prediction method for the combustion rate of high metal content water ramjet engines based on the equilibrium temperature of the combustion surface, such as figure 1 shown, including the following steps:

[0074] Step S100: establishing a fuel combustion model for the ignition process of the water-reactive metal fuel;

[0075] Step S110: Determine the combustion products of the water-reactive metal fuel at combustion equilibrium through thermodynamic calculations, the combustion products are products whose mass fraction accounts for more than 1% of the total mass of substances in the combustion system, and determine the combustion products in the combustion system according to the combustion products The main reaction in the gas phase reaction zone;

[0076] Step S120: Establish a fuel combustion model responsive to the burning surface temperature according to the main reaction, and the fuel combustion model responsive to the burning surface temperature i...

Embodiment 2

[0085] A theoretical method for predicting the burning rate of a water ramjet with a high metal content based on the combustion surface equilibrium temperature with a 73% magnesium-based water-reactive metal fuel (Mg73%wt / AP19%wt / HTPB8%wt) system as the water metal fuel comprises the following steps:

[0086] Step S100: Establish a combustion model for the ignition process of the water-reactive metal fuel.

[0087] Step S110 determines the combustion products at fuel balance through thermodynamic calculations. To simplify the calculation, only the parts with a mass percentage greater than 1% are considered. The component categories and their respective mass percentages are listed in Table 1.

[0088] Table 1 73% Mg-based water ramjet fuel combustion equilibrium product composition list

[0089]

[0090] According to AP(NH 4 ClO4 ), HTPB (C 4 h 6.052 o 0.052 ) and thermal decomposition characteristics of Mg and combustion products, assuming the main reaction in the gas p...

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Abstract

The invention relates to a method for theoretically predicting the burning rate of a water ramjet with high metal content on the basis of equilibrium temperature of a burning surface. Firstly, a combustion model of a fuel ignition process of the water ramjet is established, the contradictions that a traditional solid fuel burning rate model (a Vieri formula) needs to fit undetermined parameters through a test result and a test of the water ramjet with high metal content needs to be conducted on the premise of grasping the fuel burning rate are overcome, and the method can be used for determining an estimated value of the thermodynamic equilibrium temperature of the fuel burning surface and an approximate range of reasonable water inlet amount design. By combining with a water reaction metal fuel ignition powder combustion model, the mass, momentum and energy transport quantity of fuels and ignition powder to a flow field are converted into source items close to grids of a first layer of the burning surface and grids of a covering area of the ignition powder, gas / solid / liquid multiphase coupling calculation in the flow field of the ramjet is achieved, the temperature distribution ofthe burning surface of the fuels in an ignition process can be obtained, correspondingly the burning rate of the ramjet is predicted, and the ignition and working state of the ramjet is determined.

Description

technical field [0001] The invention relates to the technical field of engine multi-field and multi-phase coupling simulation calculations, in particular to a theoretical prediction method for the combustion rate of a water ramjet engine with high metal content based on the equilibrium temperature of the combustion surface. Background technique [0002] The water ramjet engine is a fuel-rich propulsion system with water-reactive metals (magnesium, aluminum, etc.) as the main component. The engine itself carries very little oxidant. The drag reduction technology can enable the underwater vehicle to achieve a navigation speed of up to 200 knots, making up for the shortcomings of the low speed when the propeller is propelled or the short range when the solid rocket motor is propelled. The products of fuel decomposition and combustion react violently with seawater in the combustion chamber, constituting the main heat-kinetic energy conversion source of the engine. Theoretically...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16C20/10
Inventor 胡凡董戈张炜张士峰江振宇张为华
Owner NAT UNIV OF DEFENSE TECH
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