GB734486A - Improvements relating to jet propulsion engines for submerged or floating vessels - Google Patents

Abstract

734,486. Jetpropulsion plant. PALLEMEARTS, J. E. H. April 27, 1950, No. 10429/50. Class 110 (3). [Also in Groups XI and XII] A jet engine for propelling a surface or submerged vessel and shown in sectional elevation in Fig. 2, includes a combustion chamber comprising a substantially hemispherical head portion N, mounted inside the vessel and a tail portion E, protruding aft of the vessel, the tail portion having a forward end matching the base of the head portion and then tapering to a smaller area at the discharge end, the centre line of the tail portion sloping downwardly in a rearward direction from the forward end and curving gradually to a horizontal direction. The after end of the tail portion tapers outwardly in plan view as shown in Fig. 6 and terminates in an orifice O shaped as shown in this Figure and in the end elevation shown in Fig. 7. The section at JJ is circular and constriction of the orifice occurs along the lines TT. The combustion chamber, Figs. 2 and 5, comprises an inner shell with a refractory lining E<SP>3</SP> and an outer casing E<SP>2</SP> separated from the inner shell by heat insulation E<SP>1</SP>. The wall of the head portion is provided with cavities L for preheating the fuel supply to a spray nozzle 6 and cavities M for cooling water which afterwards passes to a preheating coil 13 connected to a series of spray nozzles 15. Combustion is supported by air or oxygen obtained by decomposition of an oxygen-yielding fluid, e.g. H 2 O 2 . The air or fluid is supplied to a preheating coil H terminating in a nozzle g<SP>1</SP>. The nozzle injects a spray into the interior of a hollow body I provided with a central outlet nozzle g2 and a ring of outlet nozzles I<SP>2</SP>. A deflector g<SP>3</SP> is arranged in front of the entrance to nozzle g<SP>2</SP>. The body I and coil H are arranged in a shroud K and a carbon ring 3 on to which the fuel is sprayed is secured to the outside of the body. Starting is effected by means of an auxiliary fuel supply 4, an oxygen supply 2, and an ignition plug Q. The water sprays from nozzles 15 enter ducts formed between plates 16 and are converted into steam. When not in operation the chamber contains water p<SP>1</SP> up to the level Xl and air P trapped above the water level. Upon cessation of use compressed air is supplied from 10 to the chamber to prevent the water entering therein from rising above the level X<SP>1</SP>. Specification 734,484, [Group XXXIII], is referred to.