CN2367811Y

CN2367811Y - Blade with rough surface

Info

Publication number: CN2367811Y
Application number: CN 99207919
Authority: CN
Inventors: 赵桂林
Original assignee: Institute of Mechanics of CAS
Current assignee: Institute of Mechanics of CAS
Priority date: 1999-04-15
Filing date: 1999-04-15
Publication date: 2000-03-08
Anticipated expiration: 2009-04-15

Abstract

The utility model relates to a blade with a rough surface, which is used for impeller machinery. Flow direction micro-groove structures are arranged on the surface of the utility model; the flow direction micro-groove structures form a zigzag shape, or a W shape, or a fan shape, etc., which are of equal intervals or unequal intervals; the quantities of flow direction micro-grooves are not limited, and the widths and the heights of the flow direction micro-grooves are from 20 mum to 200 mum. The utility model effectively controls flow in a cascade flow channel, and reduces the secondary flow loss, the blade shape loss and the trail loss of the blade cascade. The reduction amount of the total loss of the cascade is more than 20 % at the most, and the efficiency of the impeller machinery is enhanced finally.

Description

A kind of blade with rough surface

The utility model relates to the blade that turbomachine is used, and particularly relates to the blade that a kind of turbomachine with non-smooth surface is used.

In turbomachines such as steam turbine, turbogenerator, gas compressor and blower fan, all adopt blade at present, as shown in Figure 1.The loss of turbomachine blade cascade is big more, and the efficient of turbomachine is low more, and therefore, one of efficient main path that improves turbomachine is to reduce the blade cascade loss.

All the time, people think that the surface is smooth more, and resistance is more little, and the loss that causes thus is just more little.Therefore, when making the turbomachine blade, all blade surface is processed very smooth, thought that blade surface is smooth more, its loss is more little, and the efficient of turbomachine is high more.

But, result of practical application is different, the secondary flow loss of smooth blades, profile loss and tail are lost in and occupy about 80% ratio in the cascade loss, therefore, reduce cascade loss especially reduces secondary flow loss, profile loss and tail loss etc. and only depends on and adopt smooth blades not achieve the goal.

The purpose of this utility model:

Main purpose of the present utility model is for the secondary flow loss that reduces blade cascade, profile loss and tail loss, and then minimizing cascade loss, improve the internal flow of turbomachine, finally improve the efficient of turbomachine, thereby a kind of blade with rough surface is provided.

The purpose of this utility model is achieved in that

A kind of blade with rough surface that the utility model provides is normally used blade surface to be processed into have the non-smooth surface (being rough surface) that flows to micro groove structure, its flow to micro groove structure as: uniformly-spaced or the flexuose of unequal interval, W type, fan-shaped etc., or having abnormal flow to the surface that micro groove structure is arranged, the quantity that flows to microflute is unrestricted.According to the difference of local boundary layer thickness, generally between 20 μ m～200 μ m, the height of microflute is also between 20 μ m～200 μ m for the width that flows to microflute.

The utility model provides a kind of blade with rough surface, its lip-deep microflute that flows to mainly plays following effect, flow on the one hand microflute and suppress along the exhibition of blade surface to flowing, and then hinder the enhancing in leaf grating runner internal channel whirlpool, reduced secondary flow loss; Flow to microflute on the other hand and changed the nearly wall boundary layer structure on the blade surface, suppressed the development of boundary layer on blade surface, weakened the separation that is flowing in the leaf grating outlet port, weakened the tail whirlpool, reduced the loss of profile loss and tail.The final result of above-mentioned two aspect effects is to have reduced cascade loss.

Effect of the present utility model:

The blade with rough surface that the utility model provides has the non-smooth surface that flows to microflute owing to blade surface is processed into, controlled flowing in the leaf grating runner effectively, reduce secondary flow loss, profile loss and the tail loss of blade cascade, the reduction of leaf grating total losses the most nearly more than 20%, has finally improved the efficient of turbomachine.

Below in conjunction with drawings and Examples the utility model is described in detail:

Fig. 1 is the blade structure schematic representation of normally used smooth surface;

Fig. 2 is that blade surface is processed into flexuose and flows to the micro groove structure schematic representation;

Fig. 3 is that blade surface is processed into the W type and flows to the micro groove structure schematic representation;

Fig. 4 is that blade surface is processed at interval that flexuose flows to the micro groove structure schematic representation;

Fig. 5 is that blade surface is processed into the protruding fan-shaped micro groove structure schematic representation that flows to;

Fig. 6 is that blade surface is processed into the fan-shaped micro groove structure schematic representation that flows to of unequal interval;

Fig. 7 is that blade surface is processed into recessed sector structure schematic representation;

Drawing is described as follows:

1---blade 2 of smooth surface---flows to micro groove structure

Embodiment 1:

With the blade of steam turbine, blade surface is processed into the structure of Fig. 2, have the rough surface that equally spaced flexuose flows to microflute on its blade surface, wherein flexuose flows to the width of microflute about 20 μ m and height 10 μ m.

And the blade surface that turbogenerator, gas compressor, blower fan are used all can be processed into the structure of Fig. 2, and generally between 20 μ m～200 μ m, the height of microflute is also between 20 μ m～200 μ m for its width that flows to microflute.Embodiment 2:

With the blade of steam turbine, blade surface is processed into the structure of Fig. 2, have the rough surface that equally spaced flexuose flows to microflute on its blade surface, wherein flexuose flows to the width of microflute about 120 μ m and height 40 μ m.Embodiment 3

Blade with turbogenerator, blade surface is processed into the structure of Fig. 3, has the rough surface that the W type flows to microflute on its blade surface, wherein the W type flows to first tooth of microflute and the width between second tooth about 200 μ m, the height of first tooth is 70 μ m, and the height of second tooth is 35 μ m.Embodiment 4

With the blade of blower fan, blade surface is processed into the structure of Fig. 5, have the protruding fan-shaped structure that flows to microflute on its blade surface, the fan-shaped width of microflute that flows to of its convexity is about 100 μ m and height 50 μ m.(blade processing of turbogenerator, gas compressor, steam turbine is all identical) embodiment 5

The blade of turbogenerator is processed into the structure of Fig. 6 with blade surface, has the fan-shaped rough surface that flows to microflute at interval on its blade surface, the wherein uniformly-spaced fan-shaped width that flows to microflute about 50 μ m and height about 50 μ m.Embodiment 6

The blade of turbogenerator is processed into the structure of Fig. 7 with blade surface, has the recessed fan-shaped rough surface that flows to microflute on its blade surface, the wherein fan-shaped at interval width that flows to microflute about 50 μ m and height about 30 μ m.

Claims

1 one kinds of blades with rough surface is characterized in that: be arranged with on blade surface and flow to micro groove structure.

2 a kind of blades with rough surface as claimed in claim 1 is characterized in that: it flows to micro groove structure for uniformly-spaced or the flexuose of unequal interval, W type, sector structure, or has abnormal flow to micro groove structure.

3 as claim 1,2 described a kind of blades with rough surface, it is characterized in that: it flows to the well width of micro groove structure and highly all between 20 μ m～200 μ m.