RU182039U1 - Liquid Cooled Sampler - Google Patents

Abstract

The utility model relates to gas analysis technology, heat power engineering, and aviation technology and is intended for sampling products of the combustion of hydrocarbon fuels for chemical analysis from flowing parts of aircraft gas turbine engines, ground gas turbine installations, specialized plants using model burners, model combustion chambers, and other power plants with combustion fuel. The sampler consists of an input device, a sampling channel and a cooling system channel, located coaxially. The flow parts of the sampling channels and the cooling system are equipped with fins, and the input device is profiled according to the principle of a Laval nozzle. The technical result of the utility model is to minimize the cooling time of the flowing sample to a temperature at which chemical reactions are significantly slowed down, as well as to reduce the influence of the sampler as a measurement tool on the processes occurring in the studied stream. 3 s.p. f-ly, 3 ill.

Description

The utility model relates to gas analysis technology, heat power engineering, and aviation technology and is intended for sampling products of the combustion of hydrocarbon fuels for chemical analysis from flowing parts of aircraft gas turbine engines, ground gas turbine installations, specialized plants using model burners, model combustion chambers, and other power plants with combustion fuel.

Sampler designs are known that contain measures for liquid cooling of an inflowing gaseous sample taken from areas with elevated temperature, and the sample and cooling channels have a developed multi-level structure realized using welded joints (US 5824919 A, G01N 1/22, 10.20.1998; US 5228514 A, G01N 30/12, 07.20.1993; US 5344122 A, G01N 1/22, 09/06/1994; US 5158365 A, G01K 13/12, 10/27/1992).

Known designs are difficult to manufacture and assemble, have significant diametrical dimensions (15 ... 50 mm), which has a negative effect on the structure of the studied stream.

The closest analogue is the design of the sampler, designed to select combustion products for chemical analysis from the furnace at elevated temperatures, the supply and removal of coolant in which is organized using a half-ring channel of two parts, which communicate at the point of rupture of the partition, and the sample channel is equipped with a coarse filter purification, trapping solid particles and non-volatile hydrocarbons (US 5777241 A, G01N 1/22, 07/07/1998).

The disadvantage of this design is the low rate of cooling of the flowing sample to a temperature at which the chemical reactions are significantly slowed down, which does not allow us to accept the assumption that there is no difference in the chemical composition of the working fluid in the sampling spot and at the inlet to the gas analyzer.

The objective of the utility model is to reduce the quantitative difference in sample composition at the sampling point and the analyzed sample, as well as to reduce the influence of the sampler on the structure of the studied stream.

The technical result of the utility model is to minimize the cooling time of the flowing sample to a temperature at which chemical reactions are significantly slowed down, as well as to reduce the influence of the sampler as a measurement tool on the processes occurring in the studied stream.

The technical result is achieved in that in a liquid-cooled sampler consisting of an input device, a sampling channel and a cooling system channel, arranged coaxially, the flow parts of the sampling channels and a cooling system are equipped with fins, and the input device is profiled according to the principle of a Laval nozzle, which, when critical mode of evacuation of the gas analyzer tract (or overpressure in the test stream) will allow aerodynamic cooling of the working fluid as a result of acceleration of the flow of the supersonic velocities and reduce its static parameters.

In addition, the sampler is made of steel powder by selective laser sintering.

In addition, the finning of the sampling channels and the cooling system is made in the form of a trapezoidal projection system.

In addition, the diameter of the working part of the sampler does not exceed 6 mm.

The device is illustrated by the following drawings.

In FIG. 1 is a diagram of a liquid-cooled longitudinally-half-cut sampler;

in FIG. 2 shows a local view of the fins of the flow part of the channels;

in FIG. 3 shows the streamlines in the flow part of the sample channel.

The design consists of a working part, which contains an input device (1), a sample channel (2), a cooling channel (3), an outer shell (4), an inner shell (5), a dividing wall (6), fins (a system of trapezoidal protrusions) (7), and an end device, which in turn contains water inlet (8) and output (9) nozzles, sample outlet nozzle (10), technological thickening (11), underwater (12) and outlet (13) water tubes, sample outlet tube (14).

The design works as follows.

The sampler is mounted in the coordinate device that controls its position by means of technological thickening 11. The sample taken from spot 15, due to evacuation of the path behind the sampler (or overpressure in front of it), flows through the input device 1, where it undergoes primary aerodynamic cooling, into the sample channel 2 The coolant through the underwater tube 12 and the inlet pipe 8 flows into the cooling channel 3. The flows in the channels 2 and 3 are turbulized by a section of the trapezoidal projection system 7, the length of which is brane based on gas-dynamic calculation, which leads to renewal of the boundary layer at the walls of the inner shell 5 with a thickness of 0.3 mm and enhancement of convective heat exchange between the refrigerant and the sample (for samples from channel walls shown in FIG. 3). Smooth walls of the outer shell 4 with an increased thickness of 0.5 mm reduce heat transfer between water and the flow outside the sampler. The cooled sample is discharged from the sample channel 2 through the pipe 10 and the tube 14, and cooling water through the pipe 9 and the pipe 13.

Claims (4)

1. A liquid-cooled sampler, consisting of an input device, a sampling channel and a cooling system channel, arranged coaxially, characterized in that the flow parts of the sampling channels and cooling system are equipped with fins, and the input device is profiled according to the principle of a Laval nozzle. 2. A liquid-cooled sampler according to claim 1, which is made of steel powder by selective laser sintering. 3. The liquid-cooled sampler of claim 1, wherein the finning is in the form of a trapezoidal protrusion system. 4. A liquid-cooled sampler according to claim 1, the diameter of the working part of which does not exceed 6 mm.

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