Vehicle and propulsion system with gaseous fuel system

Abstract

A vehicle including a propulsion system is provided. The propulsion system includes a compressor section, a heat addition system, and an expansion section in serial flow arrangement. A fuel system is configured to provide a flow of gaseous fuel to the heat addition system to generate combustion gases. A thermal management system configured to receive a flow of air from the propulsion system. A lubricant system is configured to provide a flow of lubricant to the propulsion system. A hydraulic system is configured to provide a flow of hydraulic fluid to the propulsion system. The thermal management system provides the flow of air in thermal communication with the lubricant system and the hydraulic system.

What is claimed is: 
     
         1 . An aircraft propulsion system, the propulsion system comprising:
 a compressor section, a heat addition system, and an expansion section in serial flow arrangement, wherein the heat addition system is configured to receive a flow of gaseous fuel from a fuel system, and wherein the flow of gaseous fuel is provided to the heat addition system to generate combustion gases;   a lubricant system configured to provide a flow of lubricant through the propulsion system;   a hydraulic system configured to provide a flow of hydraulic fluid to an actuator at the propulsion system; and   a thermal management system configured to provide a flow of fluid in thermal communication with the lubricant system and the hydraulic system.   
     
     
         2 . The propulsion system of  claim 1 , wherein the lubricant system is positioned in serial thermal communication downstream of the thermal management system. 
     
     
         3 . The propulsion system of  claim 2 , wherein the hydraulic system is positioned in serial thermal communication downstream of the lubricant system. 
     
     
         4 . The propulsion system of  claim 1 , wherein the fuel system is configured to provide a direct flow of gaseous fuel to the heat addition system. 
     
     
         5 . The propulsion system of  claim 1 , wherein the thermal management system comprises a turbine configured to receive the flow of fluid via a fluid circuit extended in fluid communication from the compressor section. 
     
     
         6 . The propulsion system of  claim 5 , wherein a flow control device is positioned along the fluid circuit upstream of the turbine and downstream of the compressor section. 
     
     
         7 . The propulsion system of  claim 6 , wherein the flow control device is configured to separate the flow of fluid into a first portion directed to the turbine and a second portion directed to a flow device. 
     
     
         8 . The propulsion system of  claim 7 , wherein the flow device is configured to receive the first portion of the flow of fluid downstream of the turbine and the lubricant system. 
     
     
         9 . The propulsion system of  claim 8 , wherein the flow device is configured to receive the second portion of the flow of fluid bypassing the turbine. 
     
     
         10 . The propulsion system of  claim 5 , wherein the turbine is operably coupled to a turbomachine. 
     
     
         11 . The propulsion system of  claim 10 , wherein the fluid circuit is extended from the turbomachine downstream to thermal communication with the hydraulic system. 
     
     
         12 . A vehicle, the vehicle comprising:
 a propulsion system comprising a compressor section, a heat addition system, and an expansion section in serial flow arrangement;   a fuel system configured to provide a flow of gaseous fuel to the heat addition system to generate combustion gases;   a thermal management system configured to receive a flow of fluid from the propulsion system;   a lubricant system configured to provide a flow of lubricant to the propulsion system; and   a hydraulic system configured to provide a flow of hydraulic fluid to an actuator at the propulsion system,   wherein the thermal management system provides the flow of fluid in thermal communication with the lubricant system and the hydraulic system.   
     
     
         13 . The vehicle of  claim 12 , wherein the lubricant system is positioned in serial thermal communication downstream of the thermal management system. 
     
     
         14 . The vehicle of  claim 13 , wherein the hydraulic system is positioned in serial thermal communication downstream of the lubricant system. 
     
     
         15 . The vehicle of  claim 12 , wherein the fuel system is configured to provide a direct flow of gaseous fuel to the heat addition system. 
     
     
         16 . The vehicle of  claim 12 , wherein the fuel system is configured to provide the flow of gaseous fuel as a hydrogen gas to the heat addition system. 
     
     
         17 . The vehicle of  claim 12 , wherein the thermal management system comprises a turbine configured to receive the flow of air via a fluid circuit extended in fluid communication from the compressor section. 
     
     
         18 . The vehicle of  claim 17 , wherein a flow control device is positioned along the fluid circuit upstream of the turbine and downstream of the compressor section. 
     
     
         19 . The vehicle of  claim 18 , wherein the flow control device is configured to separate the flow of air into a first portion directed to the turbine and a second portion directed to a flow device, and wherein the flow device is configured to receive the first portion of the flow of air downstream of the turbine and the lubricant system, and wherein the flow device is configured to receive the second portion of the flow of air bypassing the turbine. 
     
     
         20 . The vehicle of  claim 19 , wherein the turbine is operably coupled to a turbomachine, and wherein the fluid circuit is extended from the turbomachine downstream to thermal communication with the hydraulic system.