Experiment Instructions

HM 150.08 Impact of Jet Apparatus

04/2004

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Experiment Instructions

Please read and follow the safety regulations before the first installation!

Publication-no.: 917.000 08 A 150 02 (A) DTP_4

HM 150.08 IMPACT OF JET APPARATUS

Table of Contents

1 Unit Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2 Preparing and Performing the Experiment . . . . . . . . . . . . . . . . 2

3 Calculation of Theoretical Jet Force . . . . . . . . . . . . . . . . . . . . . 3

3.1 For Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

3.2 For Hemisphere. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

3.3 For Slope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3.4 For Cone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

4 Results of Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4.1 Measured Values for Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4.2 Measured Values for Hemisphere . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4.3 Measured Values for Slope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4.4 Measured Values for Cone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5.1 Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5.2 Hemisphere . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5.3 Slope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5.4 Cone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

6 Evaluation of Experiment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

6.1 Comparison of Theoretical and Measured Force . . . . . . . . . . . . . . . 9

6.2 Comparison of the Four Bodies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

7 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

HM 150.08 IMPACT OF JET APPARATUS

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1 Unit Description

The unit is designed to investigate jet forces im-pacting against stationary deflectors.

The impact forces are produced by a water jet.

The impact forces are measured using a lever me-chanism and loading weights.

The impact forces of the water jet are set via theflow rate. Water is supplied either from the HM150basic flow module or by way of the laboratorymains.

The HM150 enables a closed water circuit to beconstructed.

The unit essentially consists of:

– Base Plate [7]

– Inlet connection [8]

– Drain connection [6]

– Perspex vessel [5]

– Nozzle [4]

– Deflector [3]

– Lever mechanism [2]

– Loading weights [1]

Various deflectors can be fitted at position [3].

– Plate

– Hemissphere

– Slope

– Cone

1 Unit Description 1

HM 150.08 IMPACT OF JET APPARATUS

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2 Preparing and Performing the Experiment

Performance of Experiment:

– Place the test set-up on the HM150 so thatthe drain routes the water into the channel.

– Fit connecting hose between HM150 andunit.

– Open HM150 drain.

– Assemble deflector [1], (Plate, Hemisphere,Slope or Cone ). Loosen the 3 screws [3] onthe cover [4] and remove cover together withlever mechanism. Fit appropriate deflector.Do not forget to tighten lock nut [2] on rod.Screw cover back onto vessel.

– Use adjusting screw [5] to set pointer to zero(zero notch [7]). When doing so, do not placeany loading weights on measurement sys-tem [8].

– Apply desired loading weight [8] 0.2N; 0.3N;1N; 2N; 5N or combinations thereof.

– Close main HM150 cock.

– Switch on HM150 pump.

– Carefully open main cock until pointer is onzero again.

– Close HM150 drain cock.

– Determine volumetric flow. This involves rec-ording time t required to fill up the volumetrictank of the HM150 from 20 to 30 litres.

– Add loading weights and note down time t for10 litres.

– Switch off pump, open drain.

2 Preparing and Performing the Experiment 2

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3 Calculation of Theoretical Jet Force

The theoretical jet force is calculated from the prin-ciple of linear momentum

The density of the water is ρ = 1kgl

3.1 For Plate

F V w wth = ⋅ ⋅ −.

)(ρ 1 2

if w 2 0= then

F V wth = ⋅ ⋅.

ρ 1

3.2 For Hemisphere

F V w wth = ⋅ ⋅ −.

)(ρ 1 2

if w w2 1= − then

F V wth = ⋅ ⋅ ⋅2 1

.ρ

3 Calculation of Theoretical Jet Force 3

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w1

w2w2

Fth

x

y Plate

Fth

x

y

w1

w2 w2

Hemisphere

3.3 For Slope

F V wx = ⋅ ⋅ ⋅� cosρ α1

F F withth x= ⋅ = °cos α α 45

F V wth = ⋅ ⋅ ⋅� cosρ α12

Attention!Please note direction of coordinate axis!

3.4 For Cone

F V w wth x= ⋅ ⋅ −� ( )ρ 1 2

w w with2 1 45= − ⋅ = °cosα α

w wx2 2= ⋅ cos α

F V wth = ⋅ ⋅ ⋅ +� ( cos )ρ α121

3 Calculation of Theoretical Jet Force 4

HM 150.08 IMPACT OF JET APPARATUS

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w1

w2

w2Fth

Fx

x y

Slope

45°

Fth

x

y

w1

w2 w2

Cone

270°

7 Technical Data

Perspex cylinder:

Diameter : 200 mm

Hight : 340 mm

Set of weights:

4 pc. of 0.2 N

3 pc. of 0.3 N

2 pc. of 1 N2 pc. of 2 N

2 pc. of 5 N

Flow rate: max. 45 ltr/min

Main dimensions:

Length: 400 mm

Width: 400 mm

Height: approx. 875 mm

Weight: approx. 23 kg

7 Technical Data 10

HM 150.08 IMPACT OF JET APPARATUS

DTP_404/2004

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