To study the characteristics of flapper nozzle system
Block Diagram:
Specifications:
Dial Gauge : Least count 1m
Air filter regulator : Range 0-2.5 kg/cm2
Pressure gauge : Range 0-2.5 kg/cm2 (2 Nos) Theory:
The set up helps in understanding conversion of mechanical
motion to pressure signal. It consists of flapper - nozzle
mechanism, Dial gauge indicator, pressure gauges and air filter
regulator. A regulated supply of pressure, usually over 20 psig,
provides a source of air through the restriction. The nozzle is
open at the end where the gap exists between the
nozzle and flapper and air escapes in this region.
Procedure:
1) Adjust the air supply to 20 psig by air regulator. 2)
Increase the gap between flapper a n d nozzle by gap adjusting
screw. Note
the pressure gauge reading for change in nozzle gap. Ensure that
supply pressure is maintained at 20 psi.
3) Repeat the set of observation by decreasing the gap.
Observations:
S.No. Nozzle Gap(m) Signal Pressure(Psig)
Calculations:
To calculate gain of flapper nozzle system.
Gain of flapper nozzle system =
psi /mm.
Model Graph:
Summary and Conclusions:
Observed the variation of signal pressure with nozzle gap and
gain of the flapper nozzle
