A sand supply device for gas turbine engine sanding experiments

Abstract

The present application relates to the field of gas turbine technology, specifically to a sand supply device for gas turbine engine sand dust deposition experiment; including box, air intake system, air outlet system, stirring system and dust concentration measuring instrument; air intake system is arranged in the lower part of the box; the air outlet system is arranged in the upper part of the box, and the air outlet system contains height-adjustable air outlet; the input end of the air outlet is provided with an air outlet inlet flow diverter; the stirring system is installed at the bottom of the box, including servo motor, motor support and stirring impeller. According to the target particle concentration, the height of the air outlet inlet flow diverter is adjusted as the main means, and the air inlet flow and speed of the air inlet and the stirring impeller speed are fine-tuned, and through the coupling effect of the three, the high, medium and low concentration levels can be continuously adjusted, covering the engine full working condition sand dust simulation demand, solving the problem of single adjustment mode and insufficient precision of traditional device.

Description

Technical Field

[0001] This invention relates to the field of gas turbine technology, specifically to a sand supply device for sand and ash deposition experiments in gas turbine engines. Background Technology

[0002] When aero-engines operate in harsh environments containing particulate matter such as sand and fly ash, the inhaled particles can have a variety of serious impacts on internal engine components, primarily including deposition effects and erosion wear. On the one hand, with global environmental changes and increased aero-engine power, turbine inlet temperatures are continuously rising. Inhaled particles are prone to softening or melting at high temperatures, significantly increasing their viscosity and making them more likely to adhere to and deposit on turbine blade surfaces. Such deposition is particularly likely to occur in critical areas such as blade film cooling holes and cooling channels, and in severe cases, it can block cooling air passages, leading to a sharp decline in cooling efficiency and blade overheating. On the other hand, in cryogenic components such as compressors, the high-speed impact of hard particles can cause material loss from the blade surface, inducing erosion wear, damaging the blade aerodynamic profile, and causing compressor efficiency degradation and performance decline. Currently, research on engine particle problems largely relies on numerical simulations or simplified experimental setups.

[0003] In experimental research, sand supply devices are typically used to deliver a gas stream containing sand and ash particles to the test section. However, existing particle supply devices generally suffer from the following problems: most devices use mechanical powder feeding or simple pneumatic conveying, resulting in large fluctuations in particle output concentration, making it difficult to achieve a stable and repeatable supply, leading to a lack of reliability and repeatability in experimental data; particles directly enter the pipeline for mixing without a mixing transition zone to allow for thorough mixing with the carrier gas, making them prone to deposition or agglomeration within the pipeline, resulting in uneven particle flow entering the test section, and potentially causing a sudden and sharp increase in sand supply, deviating from the sand suction environment of the engine and failing to simulate the particle distribution in a real engine; many devices lack convenient and precise concentration adjustment mechanisms, with only a single adjustment method, making it impossible to accurately control the operating parameters required for the experiment. Summary of the Invention

[0004] The purpose of this invention is to provide a sand supply device for sand and ash deposition experiments in gas turbine engines, so as to solve the problems of low particle concentration control accuracy, poor mixing uniformity, and insufficient output stability of existing sand and ash particle supply devices.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a sand supply device for a gas turbine engine sand and ash deposition experiment, comprising a housing, an air intake system, an air outlet system, a stirring system, and a dust concentration measuring instrument.

[0006] The enclosure is a sealed pressure-bearing cavity with a top cover;

[0007] The air intake system is located in the lower part of the housing; the air outlet system is located in the upper part of the housing, and the air outlet system includes a height-adjustable air outlet duct; the lower end of the air outlet duct extends into the housing, and the upper end of the air outlet duct extends outward from the housing; an air outlet inlet guide is provided on the inlet end of the air outlet duct; and a dust concentration measuring instrument is provided on the outlet end of the air outlet duct.

[0008] The stirring system is installed at the bottom of the housing and includes a servo motor, a motor bracket, and a stirring impeller.

[0009] Furthermore, the intake system includes an intake duct, a flow meter, and an electric regulating valve;

[0010] The air intake is located at the bottom of the housing and extends into the housing from the side. The air intake end of the air intake is equipped with a flow meter and an electric regulating valve.

[0011] Furthermore, a sealing ring is provided between the top cover and the housing to ensure the airtightness of the device.

[0012] Furthermore, the inner wall of the box is equipped with fixed inclined plates and removable inclined plates;

[0013] The fixed inclined plate is welded and fixed to the inner wall of the box, and the detachable inclined plate is connected to the fixed inclined plate by bolts; the motor bracket is connected to the bottom of the detachable inclined plate, and the inclination angle of both the fixed inclined plate and the detachable inclined plate is 45°. The fixed inclined plate and the detachable inclined plate together with the inner wall of the box form a funnel-shaped structure.

[0014] Furthermore, the side wall of the enclosure is equipped with an observation window.

[0015] Furthermore, the stirring impeller is a straight-blade turbine structure with a diameter of 120mm and 8 blades. The servo motor has a rated power of 2kW and a speed range of 500-3000rpm.

[0016] Beneficial effects

[0017] This invention, based on the target particle concentration, primarily controls the output particle concentration and stability by adjusting the height of the outlet inlet guide, and simultaneously fine-tuning the inlet flow rate and velocity, as well as the impeller speed. Through the coupling effect of these three factors, the output particle concentration and stability are jointly achieved. Specifically, when it is necessary to increase the output particle mass flow rate, the height of the outlet inlet guide can be lowered to extract the high-concentration particle stream from the bottom, while the stirring speed is appropriately increased to enhance mixing uniformity. If necessary, the inlet velocity can be fine-tuned to maintain system stability. Conversely, if it is necessary to reduce the particle mass flow rate, the height of the outlet inlet guide can be raised, and the stirring speed and inlet velocity can be correspondingly reduced to avoid excessive disturbance leading to concentration fluctuations. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a top view of the present invention with the top cover removed;

[0021] Figure 3 This is a front sectional view of the present invention;

[0022] Figure 4 This is an exploded view of the mixing system;

[0023] Figure 5 This is a top view of the present invention with the top cover and fixed and detachable inclined plates removed;

[0024] Figure 6 This is a structural diagram of the first embodiment of the present invention;

[0025] Figure 7 This is a structural diagram of the second embodiment of the present invention;

[0026] Figure 8 This is a structural diagram of the third embodiment of the present invention.

[0027] In the diagram, 1. Box body; 2. Air inlet; 3. Air outlet; 4. Top cover; 5. Observation window; 6. Servo motor; 7. Motor bracket; 8. Agitator impeller; 9. Air outlet inlet guide; 10. Fixed inclined plate; 11. Removable inclined plate. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] To achieve the above objectives, the present invention provides the following technical solutions, such as... Figure 1-8 As shown, a sand supply device for a gas turbine engine sand and ash deposition experiment is provided. The gas-solid two-phase flow of the present invention is a two-phase fluid with air as the carrier gas and sand and ash particles as the solid phase; it includes a housing 1, an air inlet system, an air outlet system, a stirring system and a dust concentration measuring instrument; the dust concentration measuring instrument selected is model BH-DX103-TSP.

[0030] The enclosure 1 is made of 316L stainless steel, and the top cover 4 is sealed and fixed with a flange and a sealing ring. The inner cavity of the enclosure 1 is a cuboid structure with a width of 260mm, a length of 310mm, and a height of 600mm.

[0031] The air intake system is located in the lower part of the housing 1; the air exhaust system is located in the upper part of the housing 1, and the air exhaust system includes a height-adjustable air exhaust duct 3; the lower end of the air exhaust duct 3 extends into the interior of the housing 1, and the upper end of the air exhaust duct 3 extends outward from the housing 1; the air exhaust duct 3 is a telescopic pipe structure, and an air exhaust duct inlet guide 9 is provided on the input end of the air exhaust duct 3; the air exhaust duct inlet guide 9 rises and falls synchronously with the input end of the air exhaust duct 3; a dust concentration measuring instrument is provided on the output end of the air exhaust duct 3;

[0032] The stirring system is installed at the bottom of the housing 1, including a servo motor 6, a motor bracket 7, and a stirring impeller 8; the servo motor 6 is fixed to the motor bracket 7, and the output shaft of the servo motor 6 is connected to the stirring impeller 8; furthermore, the stirring impeller 8 is a straight-blade turbine structure with a diameter of 120mm and 8 blades, and the servo motor 6 has a rated power of 2kW and an adjustable speed range of 500-3000rpm.

[0033] Furthermore, the intake system includes an intake duct 2, a flow meter, and an electric regulating valve;

[0034] The air intake duct 2 is located at the bottom of the housing 1 and extends into the housing 1 from the side. The air intake end of the air intake duct 2 is equipped with a flow meter and an electric regulating valve.

[0035] Furthermore, a sealing ring is provided between the top cover 4 and the housing 1 to ensure the airtightness of the device.

[0036] Furthermore, the inner wall of the box 1 is provided with a fixed inclined plate 10 and a detachable inclined plate 11;

[0037] The fixed inclined plate 10 is welded and fixed to the inner wall of the housing 1, and the detachable inclined plate 11 is connected to the fixed inclined plate 10 by bolts; the motor bracket 7 is connected to the bottom of the detachable inclined plate 11, the inclination angle of the fixed inclined plate 10 and the detachable inclined plate 11 is 45°, the length of the fixed inclined plate 10 and the detachable inclined plate 11 is 1 / 2 of the height of the housing 1, and the fixed inclined plate 10 and the detachable inclined plate 11 form a funnel-shaped structure with the inner wall of the housing 1.

[0038] Furthermore, the side wall of the enclosure 1 is provided with an observation window 5; the observation window 5 is embedded in the side wall of the enclosure 1, and the glass of the observation window 5 is high temperature and high pressure resistant quartz glass with a thickness of 5-10mm. The observation window 5 adopts a groove to embed the glass, plus a sealing ring and a fixing plate, and is fastened by 8 bolts.

[0039] In operation, first open the top cover 4 of the chamber 1 and add the specified mass of sand and ash particles into the chamber 1. Then, close the top cover 4 and tighten it with the flange and sealing ring to ensure a tight seal. Next, start the air inlet 2 at the bottom of the chamber 1 and control the carrier gas flow at a set speed via an electric regulating valve. The flow meter monitors the airflow in real time. Simultaneously, start the servo motor 6 to drive the straight-blade turbine impeller 8 at a set speed, which can be adjusted within the range of 500-3000 rpm. This, along with the fixed inclined plate 10 and the detachable inclined plate 11 welded to the inner wall of the chamber 1, guides the mixing of particles and airflow. Then, adjust the height of the outlet 3 to adjust the height of the outlet inlet guide 9 from the bottom. The outlet inlet guide 9 has a funnel-shaped structure, and different heights are selected to extract particle flows of corresponding concentrations. During the process, the mixing state of the particles and airflow inside can be observed in real time through the observation window 5 on the side wall.

[0040] Before the formal experiment using the sand supply device, a dust concentration meter was used to measure and calibrate the particle mass flow rate at the outlet of air duct 3 in real time. By repeatedly adjusting the inlet air flow rate, stirring speed, and height of the outlet inlet guide 9 of the sand supply device, a database of control parameters and output flow rate can be established. During the formal experiment, by calling the parameters in this database, the sand supply device can be guaranteed to output the corresponding particle mass flow rate.

[0041] The movement of sand and ash particles within the chamber can be divided into three stages: initial suspension, homogenization, and selective output. In the initial suspension stage, the sand and ash particles introduced into chamber 1 settle at the bottom under gravity. When the airflow is activated, gas flows into chamber 1 from the outside through the air inlet duct 2. This agitates the sand and ash particles, overcoming their gravity and causing them to enter a suspended state. In the homogenization stage, the stirring impeller 8 rotates and breaks up the aggregated sand and ash particles. Simultaneously, the fixed inclined plate 10 and the detachable inclined plate 11 guide the airflow, making the distribution of sand and ash particles within the chamber more uniform. In the selective output stage, particles of different sizes and densities form concentration stratification within the chamber due to differences in settling velocity: larger and heavier particles are mainly distributed in the lower part of the chamber, while smaller and lighter particles are more distributed in the upper part. By adjusting the height of the outlet inlet guide 9, sand and ash particles from different concentration zones can be selectively extracted, thereby controlling the output mass flow rate.

[0042] Example 1: Using the present invention to output a high-concentration particle flow, the inlet guide 9 of the exhaust duct is adjusted to the bottom area of ​​the chamber, 200mm above the bottom. The total amount of sand and ash particles poured into the mixing area of ​​the chamber is 50kg. The intake velocity of the intake duct 2 is adjusted to 30m / s, and the stirring speed of the stirring impeller 8 is set to 2500rpm. Through the observation window 5, it can be observed that the particle concentration inside the chamber 1 is high, and the particles form obvious concentration stratification in the bottom area of ​​the chamber 1. Under this condition, the device can output a high-concentration sand and ash particle flow with a particle mass flow rate of (26±0.5)g / s. Measurements show that the fluctuation range of this output within 4 hours is less than ±0.4g / s. This condition is suitable for simulating the sand blowing experiment of the engine intake in a light dust environment.

[0043] Example 2: Using the medium-concentration particle flow output of this invention, the inlet guide 9 of the outlet duct is adjusted to the middle region of the chamber, 350mm above the bottom. A total of 30kg of sand and ash particles is poured into the mixing area of ​​the chamber. The intake velocity of the inlet duct 2 is adjusted to 20m / s, and the stirring speed of the impeller 8 is set to 2000rpm. Through the observation window 5, it can be observed that the particle distribution within the chamber 1 is uniform, with clear concentration stratification. Under this condition, the device can output a medium-concentration sand and ash particle flow with a particle mass flow rate of (13.0±0.3)g / s. Measurements show that the fluctuation range of this output within 4 hours is less than ±0.2g / s. This condition is suitable for studying the deposition and erosion wear characteristics of turbine blades and compressor blades in a medium-dust environment.

[0044] Example 3: Utilizing the low-concentration particle flow output of this invention, the inlet guide 9 of the outlet duct was adjusted to the upper region of the chamber, 500mm above the bottom. A total of 10kg of sand and ash particles was poured into the stirring area of ​​chamber 1. The intake velocity of the inlet duct 2 was adjusted to 15m / s, and the stirring speed of the impeller 8 was set to 1200rpm. Through the observation window, it was observed that the particle distribution inside chamber 1 was relatively sparse, with a lower particle concentration in the upper region. Under this condition, the device could output a low-concentration sand and ash particle flow with a particle mass flow rate of (4.00±0.10)g / s. Measurements showed that the fluctuation range of this output over 4 hours was less than ±0.06g / s. This condition is suitable for studying the deposition and blockage characteristics of turbine blade cooling channels in a dusty environment.

[0045] Working principle:

[0046] This invention achieves precise control of particle mass flow rate through multi-parameter coordinated control. During operation, sand and ash particles are first quantitatively added to the chamber, followed by carrier gas entering the bottom of the chamber 1 through the inlet duct 2. A servo motor 6 drives the stirring impeller 8 to rotate, breaking up sand and ash particle clusters and ensuring thorough mixing with the airflow. Fixed inclined plates 10 and detachable inclined plates 11 guide the flow field, enhancing the mixing effect. By adjusting the height of the outlet inlet guide 9, the natural vertical distribution gradient of particle concentration within the chamber is utilized to selectively extract airflows of different concentrations of sand and ash particles. The particle mixing state within the chamber can be monitored in real-time through the observation window 5, facilitating adjustments during the experiment. Once the device is running stably, it can output a sand and ash particle airflow with controllable mass flow rate, providing reliable experimental conditions for turbine blade deposition research.

[0047] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A sand supply device for sand and ash deposition experiments in gas turbine engines, characterized in that, Includes housing (1), air intake system, air exhaust system, stirring system and dust concentration measuring instrument; The box (1) is a closed pressure-bearing cavity with a top cover (4) on top. The air intake system is located in the lower part of the housing (1); the air outlet system is located in the upper part of the housing (1), and the air outlet system includes a height-adjustable air outlet duct (3); the lower end of the air outlet duct (3) extends into the housing (1), and the upper end of the air outlet duct (3) extends outward from the housing (1); an air outlet inlet guide (9) is provided on the input end of the air outlet duct (3); a dust concentration measuring instrument is provided on the output end of the air outlet duct (3); The stirring system is installed at the bottom of the housing (1) and includes a servo motor (6), a motor bracket (7) and a stirring impeller (8).

2. The sand supply device for sand and ash deposition experiments in gas turbine engines according to claim 1, characterized in that, The air intake system includes an air intake duct (2), a flow meter, and an electric regulating valve; The air intake (2) is located at the bottom of the box (1) and extends into the box (1) from the side of the box (1). The air intake end of the air intake (2) is equipped with a flow meter and an electric regulating valve.

3. The sand supply device for sand and ash deposition experiments in gas turbine engines according to claim 1, characterized in that, A sealing ring is provided between the top cover (4) and the box body (1) to ensure the airtightness of the device.

4. The sand supply device for sand and ash deposition experiments in gas turbine engines according to claim 1, characterized in that, The inner wall of the box (1) is provided with a fixed inclined plate (10) and a detachable inclined plate (11); The fixed inclined plate (10) is welded and fixed to the inner wall of the box (1), and the detachable inclined plate (11) is connected to the fixed inclined plate (10) by bolts; the motor bracket (7) is connected to the bottom of the detachable inclined plate (11), and the inclination angles of the fixed inclined plate (10) and the detachable inclined plate (11) are both 45°. The fixed inclined plate (10) and the detachable inclined plate (11) form a funnel-shaped structure with the inner wall of the box (1).

5. The sand supply device for sand and ash deposition experiments in a gas turbine engine according to claim 1, characterized in that, The side wall of the enclosure (1) is provided with an observation window (5).

6. The sand supply device for sand and ash deposition experiments in a gas turbine engine according to claim 1, characterized in that, The stirring impeller (8) is a straight-blade turbine structure with a diameter of 120mm and 8 blades. The servo motor (6) has a rated power of 2kW and a speed range of 500-3000rpm.

Images