CN103557716A - Device for recycling high temperature kerosene of scramjet engine - Google Patents

Abstract

The invention discloses a device for recycling high temperature kerosene of a scramjet engine. The device is composed of one telescoping condenser or formed by serially connecting a plurality of telescoping condensers, each telescoping condenser comprises an outer layer casing pipe and a plurality of inner layer liner pipes, the inner layer liner pipes are located in the outer layer casing pipe, the high temperature kerosene is fed into the inner layer liner pipes, normal temperature water serving as a cooling liquid is fed into the outer layer casing pipe, and the high temperature kerosene is cooled through heat convection. According to the device, the cooling kerosene of the scramjet engine can be rapidly cooled from around 600 DEG C to below 50 DEG C, so that recycling of the cooling kerosene is achieved, and environmental pollution is avoided.

Description

A kind of device reclaiming for scramjet engine high temperature kerosene

Technical field

The present invention relates to scramjet engine field, particularly a kind of retracting device for scramjet engine high temperature kerosene.

Background technology

Active cooling supersonic combustion punching engine need to carry out cooling to the combustion chamber of engine with kerosene.According to our experiment measuring, normal temperature kerosene, behind the cooling duct of scramjet engine combustion chamber of flowing through, can be warmed up to more than 600 ℃ conventionally.Now, kerosene is in gaseous state, and in order to realize the recycling of kerosene and to avoid environmental pollution, we consider cooling kerosene to carry out condensation recovery.

Condenser is generally divided into water-cooled condenser, air-cooled condenser, evaporative condenser, Sprinking condenser.Because the temperature of cooling kerosene is higher, more need to absorb rapidly kerosene heat, so we adopt water-cooled condenser.General water-cooled condenser is to using water as cooling medium, by the temperature rise of water, takes away heat.Water-cooled condenser is divided into two kinds of shell and tube condenser and tube-in-tube condensers.The general water of common shell and tube condenser heats up and only has 2～4 ℃, wants kerosene to be cooled to below 50 ℃ from 600 ℃, and the water yield needing is huge, and cooling device is very huge, is unfavorable for that laboratory used.Tube-in-tube condenser adopts coaxial sleeve, and ectonexine sleeve pipe is water flowing and liquid or gas to be cooled respectively.Tube-in-tube condenser is generally used for the freon refrigeration unit that cold is less than 25kW.But in our experiment, the heat of cooling kerosene is in 300kw left and right, and existing tube-in-tube condenser can not meet our needs.Above-mentioned maturation method is all to conduct to carry out heat exchange by cooling fluid and the slow mobile heat of thing to be cooled, can not meet in our experiment the rapid cooling demand of hot coal oil.

Summary of the invention

The technical problem to be solved in the present invention is exactly the defect existing for current water-cooled condenser, proposes a kind of device reclaiming for scramjet engine high temperature kerosene, can realize the recovery of scramjet engine high temperature kerosene.

In order to address the above problem, the invention provides a kind of device reclaiming for scramjet engine high temperature kerosene, described device is composed in series by one or more tube-in-tube condensers, described tube-in-tube condenser comprises: outer layer sleeve and Duo Gen internal layer bile duct, described internal layer bile duct is positioned at outer layer sleeve, in described internal layer bile duct, pass into high temperature kerosene, in outer layer sleeve, pass into normal-temperature water as cooling fluid, by heat convection, to high temperature kerosene, carry out cooling.

Preferably, described outer layer sleeve and internal layer bile duct are gapless stainless steel tube.

Preferably, described outer layer sleeve inside is provided with 5 internal layer bile ducts of closely placing.

Preferably, the internal diameter of described outer layer sleeve is 21.6mm, and the external diameter of internal layer bile duct is 6mm, and internal diameter is 4mm.

Preferably, described outer layer sleeve is long adopts 3 tube-in-tube condensers to be connected in series successively for 1500mm, and cooling pipe total length is 4500mm.

Preferably, described device is applicable to the high temperature kerosene that chilling temperature reaches 600 ℃.

The present invention can be cooled to the cooling kerosene of supersonic combustion punching engine rapidly below 50 ℃ from 600 ℃ of left and right, has realized recycling and reusing of cooling kerosene, has avoided environmental pollution.

Accompanying drawing explanation

Fig. 1 be the embodiment of the present invention for scramjet engine high-temperature coal oil recovery apparatus (tube-in-tube condenser) schematic cross-section;

Fig. 2 is condenser inlet oil temperature, outlet oil temperature, inlet water temperature and the outlet water temperature curve of the embodiment of the present invention.

The specific embodiment

Hereinafter in connection with accompanying drawing, embodiments of the invention are elaborated.It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can be combined mutually.

According to heat convection knowledge in hydrodynamics, can, by improving flowing velocity, the increase Reynolds number of cooling water and high temperature kerosene, improve heat exchange efficiency.We have developed a kind of but retracting device of scramjet engine high-temperature coal oil cooling that is applicable to method based on heat convection.

The present invention is based on the tube-in-tube condenser of having developed many pipelines on tube-in-tube condenser basis.As shown in Figure 1, this device is composed in series by one or more tube-in-tube condensers, tube-in-tube condenser comprises: outer layer sleeve and Duo Gen internal layer bile duct, internal layer bile duct is positioned at outer layer sleeve, in internal layer bile duct, pass into high temperature kerosene, in outer layer sleeve, pass into water as cooling fluid, by heat convection, to high temperature kerosene, carry out cooling.

In embodiments of the present invention, outer layer sleeve and internal layer bile duct are gapless stainless steel tube.

In order to guarantee cooling effectiveness, can adopt a plurality of tube-in-tube condensers to connect to lengthen cooling length.

With a specific embodiment, further describe the present invention below.

The outer layer sleeve of apparatus of the present invention is the stainless steel tube of internal diameter 21.6mm, and internal layer bile duct is the stainless steel tube of external diameter 6mm, internal diameter 4mm, and wherein 5 bile ducts are arranged in wherein.Kerosene flows through from 5 bile ducts, and cooling water is from bile duct slit flow mistake, and the two is by heat convection heat-shift.Kerosene flows through the heat convection area having increased with cooling water from 5 bile ducts, can make full use of the cooling capacity of cooling water.Every cover pipe range is 1500mm, in order to guarantee cooling capacity, 3 tube-in-tube condensers is connected, and cooling pipe total length is 4500mm.

With single channel cooling water flow 1.5kg/s, cooling water heats up 50 ℃ below, and kerosene oil flow to be cooled is 0.2kg/s, and it is example that kerosene cools to 50 ℃ from 600 ℃, and cooling capacity of the present invention is carried out to simple computation.

In outer layer sleeve, the equivalent hydraulic diameter of current is:

$D_h=\frac{4A}{S}=\frac{4\×\frac{1}{4}({21.6}^2-5\×6^2)}{21.6+5\×6}=5.55\mathrm{mm}$

Water velocity in outer layer sleeve is:

$u=\frac{\stackrel{\·}{m}}{\mathrm{\ρ}\frac{\mathrm{\π}}{4}A}=\frac{1.5\×4}{1\×{10}^3\×3.14\×286.56\×{10}^{-6}}=6.67m/s$

The Reynolds number of current is:

$\mathrm{Re}=\frac{{\mathrm{uD}}_h}{v}=\frac{6.67\×5.55\×{10}^3}{{10}^{-6}}=0.37\×{10}^5$

Nu Sener number is:

$\mathrm{Nu}=0.03{\mathrm{Re}}^{0.8}{\mathrm{Pr}}^{\frac{1}{3}}=0.03\×{(0.37\×{10}^5)}^{0.8}\×7^{\frac{1}{3}}=139$

The convection transfer rate of current is:

$h=\frac{\mathrm{Nu}\·k}{d}=\frac{258\×0.6}{5.55\×{10}^{-3}}=2.79\×{10}^4$

The heat flow density that cooling water flow can be taken away heat is:

${\stackrel{\·}{q}}_w=h\·\mathrm{\ΔT}=2.79\×{10}^4\×50=1.4\×{10}^{6}W/m^2$

For kerosene, be cooled to 50 ℃ from 600 ℃, the heat of its release is:

$Q_k=\stackrel{\·}{m}\·\mathrm{\Δh}=0.2\×1.5\×{10}^6=3\×{10}^{5}W$

The heat flow density of kerosene cooling down institute release heat is:

${\stackrel{\·}{q}}_k=\frac{3\×{10}^5}{5\×3.14\×6\×{10}^{-3}\×4.5}=7.1\×{10}^{5}W/m^2$

Because the heat flow density of the heat that cooling water can be taken away is greater than the heat flow density of kerosene cooling institute release heat, so cooling water can cool down cooling kerosene.

Below, also need to consider the pressure drop of cooling water.

According to Δ PA=τ _ws

Can obtain

$\mathrm{\ΔP}=\frac{{\mathrm{\τ}}_w\×\mathrm{\π}(21.6+5\×6)\×4.5\×{10}^{-3}}{\frac{1}{4}\mathrm{\π}({21.6}^2-5\×6^2)\×{10}^{-6}}=4.31\×{10}^5\mathrm{Pa}$

Being used for providing the water pump pressure of supply water of cooling water to condenser is 10 * 10 ⁵pa, is greater than cooling water at the droop loss of condenser, therefore condenser can be according to design condition work.

As can be seen from Figure 2, cooling oil temperature drops to 50 ℃ from 630 ℃, and water temperature raises approximately 20 ℃.By experiment, we have verified that device of the present invention is practicable.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (6)

1. the device reclaiming for scramjet engine high temperature kerosene, it is characterized in that, described device is composed in series by one or more tube-in-tube condensers, described tube-in-tube condenser comprises: outer layer sleeve and Duo Gen internal layer bile duct, described internal layer bile duct is positioned at outer layer sleeve, in described internal layer bile duct, pass into high temperature kerosene, in outer layer sleeve, pass into normal-temperature water as cooling fluid, by heat convection, to high temperature kerosene, carry out cooling.

2. device as claimed in claim 1, is characterized in that,

Described outer layer sleeve and internal layer bile duct are gapless stainless steel tube.

3. device as claimed in claim 1 or 2, is characterized in that,

Described outer layer sleeve inside is provided with 5 internal layer bile ducts of closely placing.

4. device as claimed in claim 3, is characterized in that,

The internal diameter of described outer layer sleeve is 21.6mm, and the external diameter of internal layer bile duct is 6mm, and internal diameter is 4mm.

5. device as claimed in claim 4, is characterized in that,

Described outer layer sleeve is long adopts 3 tube-in-tube condensers to be connected in series successively for 1500mm, and cooling pipe total length is 4500mm.

6. device as described in claim 1～5, is characterized in that,

Described device is applicable to the high temperature kerosene that chilling temperature reaches 600 ℃.

Images