CN202140236U

CN202140236U - Six-working-condition bidirectional tidal power generation hydraulic turbine

Info

Publication number: CN202140236U
Application number: CN201120099286U
Authority: CN
Inventors: 王正伟; 阎宗国; 彭光杰; 罗永要
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2011-04-07
Filing date: 2011-04-07
Publication date: 2012-02-08
Anticipated expiration: 2021-04-07

Abstract

The utility model belongs to the technical field of fluid machinery and engineering equipment, and particularly relates to a six-working-condition bidirectional tidal lamp bulb through-flow turbine in which a novel guide vane profile line and a novel thickness distribution law of a runner blade are adopted. The unit comprises a water inlet pipe, a lamp bulb head, a tube-shaped base, guide vanes, a runner and a tail water pipe. The shapes of the guide vanes are designed and the novel guide vane profile line is adopted, so that water flows more smoothly and the resistance loss in a flow passage is lower; the runner blade is designed. The S-shaped runner blade is adopted and the thickness from inlet to outlet is arranged according to the novel thickness variation law of the runner blade, so that both positive and negative bidirectional turbines are ensured to have high efficiencies in the operating process. Compared with a conventional tidal unit, a novel bidirectional tidal power generating unit disclosed by the utility model has the advantages that the efficiencies of the positive and negative bidirectional turbines are improved; the vibration and pressure pulsation are reduced; the mechanical strength of the runner is improved; and the dynamic stress of the runner blade is reduced, so that the occurrence probability of cracks of the runner blade is greatly reduced and the operating stability of the turbine is improved.

Description

A kind of six operating mode bidirectional tidal water turbines

Technical field

The utility model belongs to the Fluid Machinery and Engineering equipment technical field, particularly a kind of six operating mode bidirectional tidal bulb through-flow turbines that adopt brand-new stator molded lines and runner bucket thickness distribution rule.

Background technique

Built up both at home and abroad with the tide power station of building again and mainly adopted Bulb Turbine Units.Similar with other water wheels units, the performance of tidal power generation unit depends on the dynamic property of internal flow situation and unit to a great extent.In Hydraulic design; The flow field analysis of water turbine mainly relies on CFD to calculate and model test; Through the research and development of decades, can predict hydraulic performance and unsteady flow dynamic response more exactly at present, and further carry out the dynamic property research of more flow-induction.

New type double is complicated to tidal power generation unit operating conditions, comprises forward water turbine, forward water pump, forward sluicing, reverse water turbine, reverse water pump and reverse totally 6 operating modes that sluice.Because morning and evening tides unit way traffic, require forward water turbine operating mode and reverse water turbine operating mode all will possess higher efficient, traditional Hydraulic Design Method can only bonding to the efficient of water turbine operating mode, can not guarantee that generated energy is maximum.The morning and evening tides unit is because head changes soon, and the waterpower fluctuation is big, causes the unit operation poor stability, and vibration and pressure pulsation are bigger in addition, and the runner bucket dynamic stress is bigger, and runner bucket is cracked.

Summary of the invention

The purpose of the utility model is to propose a kind of high efficiency novel six operating mode bidirectional tidal water turbines.

The technological scheme of the utility model is:

This water turbine comprises successively inlet tube, cast seat and the draft tube that connects, and be arranged on bulb in the cast seat, the multi-disc stator that is connected with cast seat inwall with the bulb tail end, the runner that is installed in cast seat and draft tube intersection.

For increasing inflow-rate of water turbine, new molded lines has been adopted in the intermediate cross-section of said stator, and this molded lines has 20 points, and the position of each point in rectangular coordinate system is as shown in table 1:

Table 1: stator intermediate cross-section profile coordinate point

Sequence number	401	402	403	404	405	406	407	408	409	410
											X	-39.51	-35.33	-26.35	-16.72	-8.31	0	8.31	16.69	26.35	35.33
Y	-4.58	-0.27	2.62	3.98	4.53	4.5	4	6.81	0.32	-3.09
											Sequence number	411	412	413	414	415	416	417	418	419	420
X	39.77	35.33	26.35	16.69	8.31	0	-8.31	-16.69	-26.35	-35.33
											Y	-5.72	-5.72	-4.84	-4.09	-3.82	-3.59	-3.67	-3.94	-4.41	-5.06

The structure of said runner is: a plurality of turbine blades are evenly installed in the side at hub body, and this turbine blade can be around the pivot rotation of self;

New molded lines has been adopted in the intermediate cross-section of said turbine blade, and this molded lines has 20 points, and the position of each point in rectangular coordinate system is as shown in table 2:

Table 2: turbine blade intermediate cross-section profile coordinate point

Sequence number	801	802	803	804	805	806	807	808	809	810
											X	-81.6	-65.42	-48.84	-32.27	-14.9	0	14.9	32.27	48.84	65.42
Y	37.82	32.14	24.78	17.26	9.96	4.55	-1.97	-10.5	-19.22	-28.69
											Sequence number	811	812	813	814	815	816	817	818	819	820
X	80.05	65.42	48.84	32.27	14.9	0	-14.9	-32.27	-48.84	-65.42
											Y	-41.82	-35.24	-27.66	-19.99	-11.94	-5.47	0.5	7.97	16.24	25.43

The quantity of said turbine blade is 4.

The beneficial effect of the utility model is: improved positive and negative two-way turbine efficiency with respect to other existing morning and evening tides units; Vibration and pressure pulsation have been reduced; Increased the runner mechanical strength; Reduced the runner bucket dynamic stress, made runner bucket the crackle probability occur and reduce greatly, the operation stability of unit is improved.

Description of drawings

Fig. 1 is the schematic representation of said bidirectional tidal water turbine structure;

Fig. 2 is the structural representation of said bidirectional tidal water turbine runner;

Fig. 3 is said bidirectional tidal water turbine stator figure;

Fig. 4 is said bidirectional tidal water turbine runner bucket figure;

Fig. 5 is a said bidirectional tidal water turbine stator intermediate cross-section schematic representation;

Fig. 6 is a said bidirectional tidal water turbine stator turbine blade intermediate cross-section schematic representation.

Label among the figure:

The 1-inlet tube; The 2-bulb; 3-cast seat; The 4-stator; The 5-runner;

The 6-draft tube; The 7-hub body; The 8-runner bucket.

Embodiment

The utility model provides a kind of six operating mode bidirectional tidal water turbines, below in conjunction with accompanying drawing and embodiment the utility model is further specified.

As shown in Figure 1; This this water turbine comprises successively inlet tube 1, cast seat 3 and the draft tube 6 that connects, and is arranged on bulb 2 in the cast seat 3, the multi-disc stator 4 that is connected with cast seat 3 inwalls with bulb 2 tail ends, is installed in the runner 5 that cast seat 3 and tail water 6 are managed intersections.

As shown in Figure 2, the structure of runner 5 is: a plurality of turbine blades 8 are installed in the side of hub body 7, and turbine blade 8 can be selected 4 turbine blades for use at this around the pivot rotation of oneself.

Like Fig. 3 and shown in Figure 5, the intermediate cross-section of stator 4 is designed to brand-new molded lines, and the closed curve that this stator molded lines is made up of two sections curves of connecing of joining end to end is got 20 points from molded lines, and the position of each point in rectangular coordinate system is as shown in table 1:

Table 1: stator intermediate cross-section profile coordinate point

Two curve's equation after the match are respectively:

y＝-0.00003x ³-0.0056x ²-0.0601x+4.9358；

y＝0.000004x ²-0.0013x ²-0.0104x-3.6596。

Like Fig. 4 and shown in Figure 6; For guaranteeing the hydraulic performance and the structural strength of runner; The intermediate cross-section of turbine blade 8 is designed to the closed curve that the curve of two sections end-to-ends is formed, gets 20 points from molded lines, the position of each point in rectangular coordinate system is as shown in table 2:

Table 2: turbine blade intermediate cross-section profile coordinate point

Two curve's equation after the match are respectively:

y＝-0.0005x ²-0.4551x+4.1241，

y＝0.0001x ²-0.4556x-5.8193。

The utility model has been gone test in that TH-CX-02 model unit is enterprising, has analyzed the flow losses of each several part runner, has analyzed flow channel shape and has changed the influence to energy characteristics, cavitation performance and stability, has analyzed the hydraulic performance of different operating conditionss.Pass test data and actual effect can be found, use the unit of the utility model to improve positive and negative two-way efficient with respect to other existing morning and evening tides units; Wherein the forward turbine efficiency has reached 87.02%, and reverse turbine efficiency has reached 78.14%, has reduced vibration and pressure pulsation simultaneously; Increased the runner mechanical strength; Reduced the runner bucket dynamic stress, made runner bucket the crackle probability occur and reduce greatly, the operation stability of water turbine is improved.

Claims

1. operating mode bidirectional tidal water turbine; Comprise the inlet tube (1), cast seat (3) and the draft tube (6) that connect successively; And be arranged on bulb (2) in the cast seat (3), the multi-disc stator (4) that is connected with cast seat (3) inwall with bulb (2) tail end, the runner (5) that is installed in cast seat (3) and draft tube (6) intersection; It is characterized in that

New molded lines has been adopted in the intermediate cross-section of said stator (4), the closed curve that this stator molded lines is made up of two sections curves of connecing of joining end to end, and the coordinate of 20 points in rectangular coordinate system is as shown in the table on this molded lines:

The structure of said runner (5) is: a plurality of turbine blades (8) are evenly installed in the side at hub body (7), and this turbine blade (8) can be around the pivot rotation of self;

New molded lines has been adopted in the intermediate cross-section of said turbine blade (8), the closed curve that this molded lines is made up of two sections curves of connecing of joining end to end, and 20 positions of point in rectangular coordinate system are as shown in the table on this molded lines:

2. a kind of six operating mode bidirectional tidal water turbines according to claim 1 is characterized in that the quantity of said turbine blade (8) is 4.