The Steam Injector
A theoretical and practical treatise on the design and operation of injectors and on the flow of fluids through and the design of nozzles.
Forfatter: V. A. B. Hughes
År: 1912
Forlag: The Technical Publishing Company Limited
Sted: London
Sider: 145
UDK: 621.176
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126
THE STEAM INJECTOR.
(15) What is the difference in the requirements as to
overflow arrangements between an injector working with
cold feed water and one working with liot feed water and
high-pressure steam ? Describe an arrangement of over-
flow apparatus suitable for the latter injector.
(16) Why is the pressure in the clelivery chamber of an
injector not entirely satisfactory for loading the overflow
valves1? Describe a method of neutralising the disadvan-
tages of the use of such pressure for such purpose.
(17) Discuss the requirements of injector overflow
arrangements.
(18) What is the effect of varying the pressure of the
steam entering an injector whilst maintaining the supply
of water and the water temperature constant? Discuss the
matter in all its bearings.
(19) Describe a means for automatically varying the
water supply to an injector to suit requirements, and set
out the principle on which it is baseel.
(20) What is an adjustable injector? Describe and
sketch one form of same.
(21) What is a “ one-movement ” injector. Discuss the
advantages or disadvantages of controlling the water
supply of an injector by («) moving the steam nozzle, (b)
moving the combining nozzle, (c) water valves external to
the injector.
(22) How is the velocity of discharge of steam affeeted
by the presence of moisture in the steam ? Give a velocity
formula, and make one or more calculations to show the
effect you set out.
(23) Give a general formula, based upon the pressure
and volume of a fluid before and after discharge and upon
a coefficient, for calculating the velocity of discharge of a
fluid. What is the valuc of the coefficient for (å) dry
saturated steam, (6) superheated steam, and (c) air, all
expanding adiabatically.
(24) What is meant by the expression <r maximum
weight flow of steam”? Fully describe the phenomenon,
and discuss the conditions neoessary to obtain same.
(25) Calculate the weight of steam disoharged per