CN105604776A - Six-working-condition three-vane rotating wheel bilateral tidal power generation water turbine - Google Patents

Abstract

The invention belongs to the technical field of fluid machinery and engineering equipment, and particularly relates to a six-working-condition three-vane rotating wheel bilateral tidal bulb tubular turbine in which a brand new guide vane profile is adopted, and vanes of a rotating wheel are regular in thickness distribution. The machine set comprises a water inlet tube, a lamp base, a tubular base, vanes, the rotating wheel and a tail water tube, wherein the shapes of the vanes are designed; the brand new guide vane profile is adopted, so that flow is more smooth, and resistance loss in a flow channel is reduced; the number of the vanes of the rotating wheel is reduced from 4 to 3, so that a flow of the machine set is increased; meanwhile, the vanes of the rotating wheel are optimally designed, S-shaped vanes of the rotating wheel are adopted, and a new thickness-changing rule is adopted from an inlet to an outlet, so that a water turbine has high efficiency during running in forward and backward directions. Compared with the conventional four-vane rotating wheel tidal machine set, the six-working-condition three-vane rotating wheel bilateral tidal power generation water turbine has the advantages that the efficiency, the flow and the power of the forward-backward water turbine are increased, the vibration and pressure pulsation are lowered, and the running stability of the water turbine is improved.

Description

A two-way tidal power generation hydro turbine with six working conditions and three blade runners

technical field

The invention belongs to the technical field of fluid machinery and engineering equipment, and in particular relates to a six-working-condition three-blade runner bidirectional tidal bulb tubular water turbine adopting a new guide vane profile and runner blade thickness distribution rules.

Background technique

The tidal power stations that have been built and rebuilt at home and abroad mainly use bulb tubular units. Similar to other water turbine units, the performance of tidal power generation units depends largely on the internal flow conditions and the dynamic characteristics of the unit. In hydraulic design research, the flow field analysis of hydraulic turbines mainly relies on CFD calculations and model tests. After decades of research and development, the hydraulic performance and unsteady flow characteristics can be predicted more accurately, and more researches have been carried out. Study on the dynamic characteristics of flow induction.

The operating conditions of the new bidirectional tidal generator set are complex, including six working conditions including forward turbine, forward pump, forward discharge, reverse turbine, reverse pump and reverse discharge. Due to the two-way operation of the tidal unit, it is required that both the forward and reverse turbine working conditions should have high efficiency. The traditional hydraulic design method can only guarantee the efficiency of the one-way turbine working condition, but cannot guarantee the maximum power generation. In addition, due to the rapid change of the water head and the large hydraulic fluctuation of the tidal unit, the operation stability of the unit is poor, and the vibration and pressure pulsation are large.

Contents of the invention

In order to increase the flow rate of the unit and reduce the pressure pulsation on the blades, the present invention proposes a new high-efficiency six-working-condition three-blade runner bidirectional tidal power generation turbine, including: an inlet pipe, a pipe seat and a draft pipe connected in sequence , and the bulb body arranged in the tubular seat, the plurality of guide vanes connected with the tail end of the bulb body and the inner wall of the tubular seat, and the runner installed at the junction of the tubular seat and the draft tube; the middle section of the guide vane There are 20 points in the molded line, and the positions of each point in the Cartesian coordinate system are shown in Table 1;

Table 1: Coordinate points of guide vane intermediate section line

serial number 401 402 403 404 405 406 407 408 409 410

x -243.4 -200 -150 -100 -50 0 58 116 174 232 Y -40.67 -9.57 8.05 19.31 25.44 26.93 22.68 13.43 -0.14 -17.22 serial number 411 412 413 414 415 416 417 418 419 420 x 283.1 232 174 116 58 0 -50 -100 -150 -200 Y -36.12 -36.76 -34.21 -31.69 -29.59 -28.91 -29.47 -32.42 -38.14 -46.14

The structure of the runner is: a plurality of water turbine blades are evenly installed on the side of the hub body, and the water turbine blades can rotate around their own pivots;

There are 20 points in the profile line adopted in the middle section of the turbine blade, and the positions of each point in the Cartesian coordinate system are as shown in Table 2;

Table 2: Coordinate points of the profile line of the middle section of the turbine blade

The number of blades of the water turbine is 3.

The beneficial effects of the present invention are: compared with other existing tidal units, the efficiency of the positive and negative two-way water turbines is improved, the flow rate and power of the unit are increased, vibration and pressure pulsation are reduced, and the operation stability of the unit is improved.

Description of drawings

Fig. 1 is the schematic diagram of the structure of the two-way tidal power generating turbine;

Fig. 2 is a structural schematic diagram of the runner of the two-way tidal power generating turbine;

Fig. 3 is a guide vane diagram of the two-way tidal power generation turbine;

Fig. 4 is a diagram of the runner blades of the two-way tidal power generating turbine;

Fig. 5 is a schematic diagram of the middle section of the guide vane of the two-way tidal power generation turbine;

Fig. 6 is a schematic diagram of the middle section of the guide vane turbine blade of the two-way tidal power generation turbine;

Figure 7 is a comparison diagram of pressure fluctuations on 3 blades and 4 blades;

Figure 8 is a comparison chart of the flow rate of 3-blade and 4-blade units.

Labels in the figure: 1-inlet pipe; 2-bulb body; 3-tube seat; 4-guide vane; 5-runner; 6-draft tube; 7-round body; 8-runner blade.

detailed description

The embodiments will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, the water turbine includes an inlet pipe 1, a tubular seat 3 and a draft tube 6 connected in sequence, and a bulb body 2 arranged in the tubular seat 3, and the tail end of the bulb body 2 and the tubular seat 3 A plurality of guide vanes 4 connected to the inner wall, and a runner 5 installed at the junction of the tubular seat 3 and the tail water 6 pipe.

As shown in Figure 2, the structure of the runner 5 is as follows: a plurality of turbine blades 8 are installed on the side of the wheel body 7, and the turbine blades 8 can rotate around their own pivots, and four turbine blades are selected here.

As shown in Figure 3 and Figure 5, the middle section of the guide vane 4 is designed as a brand-new profile line, which is a closed curve composed of two curves connected end to end, and 20 points are taken from the profile line, The position of each point in the Cartesian coordinate system is shown in Table 1.

Table 1: Coordinate points of guide vane intermediate section line

serial number 401 402 403 404 405 406 407 408 409 4102 --> x -243.4 -200 -150 -100 -50 0 58 116 174 232 Y -40.67 -9.57 8.05 19.31 25.44 26.93 22.68 13.43 -0.14 -17.22 serial number 411 412 413 414 415 416 417 418 419 420 x 283.1 232 174 116 58 0 -50 -100 -150 -200 Y -36.12 -36.76 -34.21 -31.69 -29.59 -28.91 -29.47 -32.42 -38.14 -46.14

The equations of the fitted two curves are:

y=0.000001x3-0.001x2-0.0291x ^{+ 27.926} ;

y=0.0000001x3-0.0002x2+ ^{0.0124x -} 30.419.

As shown in Figure 4 and Figure 6, in order to ensure the hydraulic performance and structural strength of the runner, the middle section of the turbine blade 8 is designed as a closed curve composed of two end-to-end curves, and 20 points are taken from the profile line, The position of each point in the Cartesian coordinate system is shown in Table 2.

Table 2: Coordinate points of the profile line of the middle section of the turbine blade

The equations of the fitted two curves are:

y ⁼ -0.0000005x3-0.0001x2-0.5792x ⁺ 47.268;

y= ^{-0.0000005x3 +} 0.0002x2-0.5876x-32.644.

The present invention is tested on the TH-CX-01 model unit, the flow loss of each part of the flow channel is analyzed, the influence of the shape change of the flow channel on the energy performance, cavitation performance and stability is analyzed, and different operating conditions are analyzed hydraulic performance.

Through test data and actual effects, it can be found that compared with other existing tidal units, the unit of the present invention improves the efficiency of the forward and reverse directions, increases the overflow and power of the unit, and reduces vibration and pressure pulsation at the same time. Stability has been improved.

At present, all other tidal power turbines in the world use 4-blade runners, because the traditional concept believes that 4-blade runners have the characteristics of strong flow control ability and small pressure fluctuations in the flow channel. The three-blade runner proposed by the present invention is the only case successfully applied to tidal power station units in the world (it has been successfully applied to No. 1 unit of Jiangxia tidal power station in my country). During the research and development process, more than 30 guide vanes and The profile optimization of more than 60 runners has successfully reduced the pressure pulsation on the blades to slightly lower than that of the traditional 4-blade runner, as shown in Figure 7. At the same time, the excess flow of the unit is increased, and the high-efficiency area is shifted to a large flow, as shown in Figure 8, which ensures that the unit has more power generation, higher efficiency, and smaller pressure pulsation and vibration when the tide rises and falls.

This embodiment is only a preferred specific implementation of the present invention, but the scope of protection of the present invention is not limited thereto, any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention , should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (2)

1. A two-way tidal power generation turbine with six working conditions, is characterized in that it includes an inlet pipe (1), a tubular seat (3) and a draft pipe (6) connected in sequence, and a The bulb body (2), the plurality of guide vanes (4) connected with the tail end of the bulb body (2) and the inner wall of the tubular seat (3), and the rotor installed at the junction of the tubular seat (3) and the draft tube (6) The wheel (5) is characterized in that, in order to reduce the flow loss of the guide vane section, the profile line adopted in the middle section of the guide vane (4) is a closed curve composed of two curves connected end to end. The coordinates of the 20 points on the line in the Cartesian coordinate system are shown in the table below: serial number 401 402 403 404 405 406 407 408 409 410 x -243.4 -200 -150 -100 -50 0 58 116 174 232 Y -40.67 -9.57 8.05 19.31 25.44 26.93 22.68 13.43 -0.14 -17.22 serial number 411 412 413 414 415 416 417 418 419 420 x 283.1 232 174 116 58 0 -50 -100 -150 -200 Y -36.12 -36.76 -34.21 -31.69 -29.59 -28.91 -29.47 -32.42 -38.14 -46.14 The structure of the runner (5) is: a plurality of water turbine blades (8) are evenly installed on the side of the hub body (7), and the water turbine blades (8) can rotate around their own pivots; The profiled line adopted in the middle section of the turbine blade (8) is a closed curve formed by two curves connected end to end, and the positions of 20 points on the profiled line in the Cartesian coordinate system are shown in the table below: serial number 801 802 803 804 805 806 807 808 809 810 x -465.11 -400 -300 -200 -100 0 110 220 330 440 Y 333.89 296.91 226.07 163.24 103.44 44.62 -21.29 -91.36 -168.97 -260.84 serial number 811 812 813 814 815 816 817 818 819 820 x 511.48 440 330 220 110 0 100 200 300 400 Y -345.31 -304.79 -228.47 -159.45 -93.56 -28.55 31.84 95.74 166.55 251.54 . 2. The six-working-condition two-way tidal power generation hydro turbine according to claim 1, wherein the number of said water turbine blades (8) is three.