JPH0336905Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a blade cascade testing device for testing a plurality of blades arranged in parallel to each other, such as turbine blades.

One of the requirements that affects the performance of steam turbines is the shape of the turbine blades. A fluid test is performed to determine this shape. In particular, this type of wing is used in a state where multiple pieces are lined up,
Even in the case of a test, it is necessary to place multiple sheets side by side.
Therefore, conventionally, a blade cascade testing device as shown in FIG. 1 has been used.

Reference numeral 1 denotes a flow path with a rectangular cross section, a discharge port 1A opens to the atmosphere, and the other end communicates with an air source or blower (not shown), and a high-speed wind F flows through the flow path 1. Reference numeral 2 denotes a plurality of blades (seven blades in the figure), each of which is attached to the discharge port 1A of the flow path 1 as shown in FIG. In Fig. 2, H is the height of the blade and L is the chord length of the blade.The height H of the blade 2 is determined according to the width of the flow path 1, and the support frame 6 allows the flow paths to be aligned parallel to each other. positioned across the width.

Now, a subsonic or supersonic wind F is flowed into the flow path 1, and the flow velocity, flow direction, etc. on the wake side of the blade 2 are measured, and the measurement position is the position indicated by the dashed line X. That is, since the wind F discharged into the atmosphere from the flow path 1 travels through the stationary atmosphere, the wake of the central portion of the row of blades 2, which is less susceptible to the influence of the atmosphere, is measured.

In actual turbine blades, a large number of blades with the same blade chord length L and different blade heights H are often used. Therefore, it is necessary to test blades with different heights (hereinafter referred to as blade heights).

In order to use a blade cascade test device to understand the influence of blade height, (1) it is necessary to create blade models with various blade heights;

(2) It is necessary to create each blade cascade forward throttling duct required for the above blade model.

For these reasons, it had the drawback of requiring a huge amount of testing costs.

The present invention is based on a blade cascade test device in which a plurality of blades are attached parallel to each other across the discharge port of a flow channel with a rectangular cross section through which wind flows. In addition, since it is equipped with a height adjustment plate that is inserted through the plurality of blades and is held movable in parallel in the height direction of the blades, it is possible to use the same blade model and the same flow path outlet. Since tests can be conducted for various wing heights, testing costs can be reduced.

The present invention will be described below with reference to an embodiment shown in FIGS. 3 and 4.

1 is a flow path with a rectangular cross section, a discharge port 1A is open to the atmosphere, and the other end is connected to an air source (not shown) or a blower, and a high-speed wind F flows through the flow path 1.
flows. 2 is a plurality of blades, and the discharge port 1 of the flow path 1
A, they are positioned and attached to each other in parallel to each other by a support frame 6 so as to cross the width of the discharge port 1A. A pair of height shafts 3 are attached to the support frame 6 in parallel with the wings 2. Reference numerals 7 and 7' denote height adjusting plates, which have a size that extends vertically through the discharge port 1A, and are formed with holes through which the height axis 3 and a plurality of blades 2 are passed, and are parallel to the flow of the wind F. hand,
It is held so as to be able to move in parallel in the height direction of the wing 2. 8 is a height adjustment pipe, and 9 is a pair of spacers. The total length of the pair of spacers 9, the thickness of the height adjustment plates 7 and 7', and the length of the height adjustment pipe 8 is made to match the height of the plurality of blades 2.

Now, for the blade cascade test, first the blade height is set, so select the height adjustment pipe 8 with the same height as the blade height, sandwich this height adjustment pipe 8 between the height adjustment plates 7 and 7', and at the same time , a pair of spacers 9 are also selected and attached to the support frame 6 by the pair of height shafts 3.

Thereafter, a blade cascade test is performed on the portion sandwiched between the height adjusting plates 7 and 7'.

When changing the blade height, similarly select the height adjustment pipe 8 that meets your requirements and change the distance between the height adjustment plates 7, 7'.

As described above, according to the blade cascade test device of this embodiment, the blade height can be changed by simply moving the height adjusting plates 7, 7' while using the same blade 2, which reduces test costs and test time. This will be significantly reduced.

Although two height adjusting plates were used in the above embodiment, it goes without saying that the object of the invention can be sufficiently achieved with just one height adjusting plate.

Further, it is also possible to move the height adjustment plate in parallel using a screw and a screw shaft. In this case, there is no need to replace the height adjustment pipe each time, which is convenient.

[Brief explanation of the drawing]

Fig. 1 is a diagram of a conventional device, Fig. 2 is a perspective view of a wing, Fig. 3 is a cross-sectional view of the device showing an embodiment of the present invention, and Fig. 4 is a cross-sectional view of Fig. 3. . 1...Flow path, 2...Blade, 3...Height axis, 6...
...Support frame, 7, 7'...Height adjustment plate, 8...Height adjustment pipe, 9...Spacer.

Claims (1)

[Scope of utility model registration request] In a blade cascade test device in which a plurality of blades are attached in parallel to each other across the discharge port of a flow channel with a rectangular cross section through which wind flows, the above discharge port is longitudinally cut parallel to the flow, and the A blade cascade testing device characterized by having a height adjustment plate inserted through a plurality of blades and held so as to be movable in parallel in the height direction of the blades.