Patent Application
20200355481
Exemplary embodiments pertain to the art of exhaust valves for multiple start torpedoes. Torpedoes power systems may be configured to start and stop to meet power demands.
Disclosed is a multiple start torpedo including an aft body having an exhaust conduit defining a turbine end and a seawater end having an orifice. The multiple start torpedo includes an exhaust valve associated with the exhaust conduit including. The exhaust valve includes a fore section having a head and a valve stem. The exhaust valve includes an aft section tapered from the turbine end to the seawater end and defining a receptacle sized to receive the valve stem. The exhaust valve includes a biasing member disposed to bias the head in an extended position spaced apart from the aft section and abut the orifice in the extended position.
In addition to one or more of the features described above, or as an alternative, further embodiments may include that the head defines a concave exterior surface and the orifice receives the concave exterior surface in the extended position.
In addition to one or more of the features described above, or as an alternative, further embodiments may include that the head in a compressed position forms a teardrop shape with the aft section.
In addition to one or more of the features described above, or as an alternative, further embodiments may include that the head defines a seawater catch basin oriented toward the seawater end such that seawater inflows drive the head toward the extended position.
In addition to one or more of the features described above, or as an alternative, further embodiments may include that the seawater catch basin has an outer surface that is substantially concave.
In addition to one or more of the features described above, or as an alternative, further embodiments may include that the aft section is cropped on the seawater end.
In addition to one or more of the features described above, or as an alternative, further embodiments may include that an exhaust valve diameter of the exhaust conduit is greater than an orifice diameter of the exhaust conduit.
In addition to one or more of the features described above, or as an alternative, further embodiments may include that the aft section is suspended by stanchions along an axis of the exhaust conduit having the exhaust valve diameter.
In addition to one or more of the features described above, or as an alternative, further embodiments may include that an exhaust valve diameter profile of the exhaust conduit is sized according to an outer profile of a teardrop shape formed by the head and the aft section in a compressed position.
In addition to one or more of the features described above, or as an alternative, further embodiments may include that an exhaust valve cross-sectional exhaust area of the exhaust conduit and an orifice cross-sectional exhaust area of the exhaust conduit is same.
Also disclosed is a multiple start torpedo including an exhaust valve having a fore section having a head and a valve stem. The exhaust valve includes an aft section and defining a receptacle sized to receive the valve stem. The exhaust valve includes a biasing member having an extended position where the head is spaced apart from the aft section and a compressed position where the head and the aft section form a teardrop shape.
In addition to one or more of the features described above, or as an alternative, further embodiments may include that the head forms an inner bulbous portion of the teardrop shape and the aft section forms an inner tail portion of the teardrop shape.
In addition to one or more of the features described above, or as an alternative, further embodiments may include an aft body having an exhaust conduit defining a turbine end and a seawater end.
In addition to one or more of the features described above, or as an alternative, further embodiments may include that the aft section is tapered toward the seawater end.
In addition to one or more of the features described above, or as an alternative, further embodiments may include that the head defines a seawater catch basin oriented toward the seawater end such that seawater inflows drive the head toward the extended position.
In addition to one or more of the features described above, or as an alternative, further embodiments may include that the seawater catch basin has an outer surface that is substantially concave.
In addition to one or more of the features described above, or as an alternative, further embodiments may include that the aft section is cropped on the seawater end.
In addition to one or more of the features described above, or as an alternative, further embodiments may include that an exhaust valve diameter of the exhaust conduit is greater than an orifice diameter of the exhaust conduit.
In addition to one or more of the features described above, or as an alternative, further embodiments may include that the aft section is suspended along an axis of the exhaust conduit.
Also disclosed is a multiple start torpedo including an exhaust valve having a fore section including a head defining a maximum outer diameter and a valve stem. The exhaust valve includes an aft section and defining a receptacle sized to receive the valve stem. The exhaust valve includes a biasing member having an extended position where the head is spaced apart from the aft section and a compressed position where the head and the aft section form an inner teardrop shape having an inner bulbous portion and an inner tail portion. The multiple start torpedo includes an exhaust conduit defining a seawater end and a turbine end, including an orifice defining an orifice diameter less than the maximum outer diameter such that the head is sized to block the orifice in the extended position, and including a contour having an outer teardrop shape that mimics the inner teardrop shape having an outer bulbous portion that joins the orifice toward the turbine end and an outer tail portion that extends toward the seawater end.
The following descriptions should not be considered limiting in any way. With reference to the accompanying drawings, like elements are numbered alike:
A detailed description of one or more embodiments of the disclosed apparatus and method are presented herein by way of exemplification and not limitation with reference to the Figures.
A torpedo may include a propulsion system configured to propel the torpedo through a medium such as seawater. The propulsion system may be a hybrid electric propulsion system. Hybrid electric propulsion systems may allow a turbine or electric machine to propel the torpedo. The turbine may be used to charge an electric battery associated with the electric machine. After the battery has a full state of charge, the turbine is shut down, and the electric machine is used to propel the torpedo. An exhaust conduit associated with the turbine may guide exhaust from the turbine to exit the torpedo. The exhaust gas pressure may prevent seawater from entering portions of the exhaust conduit. When the turbine is shut down, seawater may enter the exhaust conduit and attempt to enter the turbine or other connected systems. The turbine may be started multiple times as required to charge the battery or propel the torpedo.
An exhaust valve may be disposed on the exhaust conduit to prevent seawater from entering the turbine cavity or other connected systems. The exhaust valve may be configured as a check valve such that exhaust gases from the turbine are expelled from the torpedo and seawater is blocked from entering. Further, the exhaust valve may be operated by a solenoid or motor actuator to adjust positions of the valve. The exhaust valve may exert back pressure on the turbine, reducing efficiency. The exhaust valve geometry may be configured to minimize back pressure and increase turbine efficiency.
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As shown, the head 134 in a compressed position forms a teardrop shape with the aft section 130. Teardrop shape may have a inner bulbous end 171 and inner tail end 169 corresponding to outer tail portion 168 of the exhaust conduit 126 and outer bulbous portion 170 of the exhaust conduit 126, respectively. The teardrop shape or similar shapes may form an aerodynamic exhaust valve 128 that has a reduced backpressure with respect to the attached turbine 124. The head 134 defines a seawater catch basin 148 that is oriented toward the seawater end 138. As seawater flows from the seawater end 138 toward the turbine 124, the head 134 is forced closed by the seawater received at the catch basin 148 or biasing member 142. The catch basin 148 may have any form configured to receive water or liquid. The catch basin 148 may have an outer surface configured to receive seawater. The outer surface may be concave similar to that of the outer surface of the head 134. The aft section 130 may include crop 150. The exhaust conduit 126 may have a nonuniform diameter. That is, the exhaust conduit 126 may have an orifice diameter 152 defining orifice 144. The exhaust conduit 126 may also have an exhaust valve diameter 154. The exhaust valve diameter 154 may be located in the vicinity of exhaust valve 128. The exhaust conduit 126 may also define an exhaust valve diameter profile 156 such that the exhaust conduit 126 mimics the teardrop shape of exhaust valve 128. That is, the exhaust valve diameter profile 156 is substantially parallel with an outer profile of the exhaust valve 128 in the compressed position having a teardrop shape for a portion of the exhaust conduit 126 housing the exhaust valve 128. As such, the cross-sectional exhaust area. The exhaust valve diameter 154 may be greater than the orifice diameter 152.
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The term “about” is intended to include the degree of error associated with measurement of the particular quantity based upon the equipment available at the time of filing the application.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, element components, and/or groups thereof.
While the present disclosure has been described with reference to an exemplary embodiment or embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present disclosure. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the present disclosure without departing from the essential scope thereof. Therefore, it is intended that the present disclosure not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this present disclosure, but that the present disclosure will include all embodiments falling within the scope of the claims.
