VII-R-D ETRI, VII-R-D Datasheet

VII-R-D

Manufacturer Part Number

VII-R-D

Description

Vii - R & D And Test Equipment

Manufacturer

ETRI

Datasheet

1.VII-R-D.pdf (2 pages)

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All the aerodynamic performance curves given

in the catalogue have been obtained by using a

test chamber with submerged orifice and auxi-

liary fan, described in Standard Specification

CCT 18-10. The performance curves are drawn

up for an air density of 1.2 kg/m

Test equipments

Description of the test equipment, method and

use, necessary formula to calculate flow and

pressure from instrument readings are given

in detail in CCT 18-10, to which reference

should be made for further information. Details

are given here of the test equipment and its

functioning from a practical viewpoint. The test

equipment takes the form of a large cylindrical

chamber arranged to take at one end the fan

under test and extended at the other end by a

duct connected to the auxiliary fan. In the duct

there is a shutter (b) and an inlet for ambient air,

which is controlled by shutter (a). An air tight

AERODYNAMIC TESTS

VII - R & D AND TEST EQUIPMENT

(0.075 Ib/ft

bulkhead is situated in the cylindrical chamber

in which is the orifice for flow measurement.

Pressure tappings P2 and P3 are positioned

on each side of the bulkhead. A honey comb

grid and metal meshs ensure stable airflow

upstream of the orifice. Pressure tapping P1 is

situated close to the end wall on which the fan

under test is mounted.

Because of the large dimensions of the chamber

in relation to the fan under test, the dynamic

pressure due to the velocity of the air is com-

pletely lost and static pressure is read directly

from a manometer connected to the tapping P1.

The purpose of the auxiliary fan is to cancel out

the aerodynamic resistance of the equipment,

thereby allowing the fan under test to operate

at free air conditions.

Operation (Fig.16)

With the fan under test and the auxiliary fan

both running, shutters (a) and (b) are adjusted

to give a zero reading of static pressure on P1.

Fig.16

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VII-R-D Summary of contents

Page 1

... VII - R & D AND TEST EQUIPMENT AERODYNAMIC TESTS All the aerodynamic performance curves given in the catalogue have been obtained by using a test chamber with submerged orifice and auxi- liary fan, described in Standard Specification CCT 18-10. The performance curves are drawn up for an air density of 1.2 kg/m Test equipments ...

Page 2

Technical guide The corresponding flow is calculated from the pressure differential P2-P3 and is the free air- flow. By progressively closing shutter (b) at each position a flow and static pressure can be obtained the point of complete ...

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