Abstract: Methods, apparatus, systems, and articles of manufacture are disclosed to a flux-modulated permanent magnet clutch. Disclosed is a magnetic clutch apparatus comprising a tension spring, an outer ring coupled to the tension spring, the outer ring including a first plurality of magnets, an inner ring coupled to an output shaft, the inner ring including a second plurality of magnets, the outer ring to magnetically engage with the inner ring, and an intermediate ring coupled to an input shaft, the intermediate ring disposed between the inner ring and the outer ring, the intermediate ring including a ferrous metal.

Abstract: Methods, apparatus, systems, and articles of manufacture are disclosed to reduce failure to bearings in a pump system. Disclosed herein is a pump system comprising a shaft connected to an impeller of the pump system, and a bearing to provide a dampening to the shaft, the bearing including a journal lining, the journal lining supported in the pump system, a spring-loaded foil to separate the shaft from the journal lining, an inner lining between the shaft and the spring-loaded foil, and a deformation limiter located between the spring-loaded foil and the journal lining.

Abstract: Methods, apparatus, systems, and articles of manufacture are disclosed to a flux-modulated permanent magnet clutch. Disclosed is a magnetic clutch apparatus comprising a tension spring, an outer ring coupled to the tension spring, the outer ring including a first plurality of magnets, an inner ring coupled to an output shaft, the inner ring including a second plurality of magnets, the outer ring to magnetically engage with the inner ring, and an intermediate ring coupled to an input shaft, the intermediate ring disposed between the inner ring and the outer ring, the intermediate ring including a ferrous metal.

Abstract: Conical motors for use with pumps are disclosed. Examples disclosed herein include an electric motor including a conical rotor, a first end of the conical rotor having a first diameter and a second end of the conical rotor having a second diameter, the second diameter different from the first diameter, and a conical stator aligned to the conical rotor.

Abstract: Apparatus, systems, and articles of manufacture are disclosed to dynamically support axial thrust in pumps. An example apparatus disclosed herein includes a first thrust pad, a second thrust pad, and a thrust disc between the first thrust pad and the second thrust pad, the thrust disc including a first side adjacent to the first thrust pad. a second side adjacent to the second thrust pad, an outer surface, a first channel extending between the outer surface to the first side, and a second channel extending between the outer surface of the thrust disc to the second side.

Abstract: Apparatus, systems, and articles of manufacture are disclosed to power thermal management systems with heat of a working fluid therein. Example thermal management system include: a thermal transport bus loop fluidly coupled to at least one heat source exchanger and at least one heat sink exchanger; a turbomachine including a turbine and a compressor, the turbine and compressor rotatably interlocked via a shaft, the compressor coupled to the thermal transport bus loop, the turbine including an inlet and an outlet, the inlet connected to a first point of the thermal transport bus loop via a first flowline, the outlet connected to a second point of the thermal transport bus loop via a second flowline; and a control valve coupled to the first flowline, the control valve to adjust a mass flowrate of the heat exchange fluid in the first flowline based on a speed of the shaft.

Abstract: Methods and apparatus to remove liquid from a housing are disclosed. An example system includes a pump including a chamber, a shaft positioned at least partially in the chamber, and a bearing to support the shaft, the chamber including a chamber inlet and a chamber outlet, the chamber to hold a fluid in a first state, a first conduit to carry the fluid in a second state of the fluid, the first conduit fluidly coupled to the chamber inlet, a second conduit to carry the fluid in the first state of the fluid, the second conduit fluidly coupled to the chamber outlet, at least one jet pump to deliver a mixture of the fluid in the first state of the fluid and the second state of the fluid to a third conduit, and a heat exchanger coupled to the first conduit upstream of the first inlet.

Abstract: Methods, apparatus, systems, and articles of manufacture are disclosed to a flux-modulated permanent magnet clutch. Disclosed is a magnetic clutch apparatus comprising a tension spring, an outer ring coupled to the tension spring, the outer ring including a first plurality of magnets, an inner ring coupled to an output shaft, the inner ring including a second plurality of magnets, the outer ring to magnetically engage with the inner ring, and an intermediate ring coupled to an input shaft, the intermediate ring disposed between the inner ring and the outer ring, the intermediate ring including a ferrous metal.

Abstract: Impeller bearings for pumps are disclosed. An example fluid pump includes a motor, a shaft coupled to a rotor of the motor, an impeller coupled to the shaft forward of the motor, the impeller including blades to pump a fluid, a first radial bearing positioned around the shaft aft of the motor, a second radial bearing positioned around the impeller, and guide vanes extending radially from the second radial bearing upstream of the blades of the impeller.

Abstract: Example thrust bearing apparatus disclosed herein include: a thrust disk extending radially from the shaft, the thrust disk having a first side and a second side opposite the first side; a bearing housing surrounding the thrust disk and the shaft, the bearing housing having a first wall facing the first side of the thrust disk and a second wall facing the second side of the thrust disk; a first thrust pad coupled to the first wall of the bearing housing, the first thrust pad including a first plurality of serrations circumferentially arranged in a first pattern along the first thrust pad; and a second thrust pad coupled to the first side of the thrust disk, the second thrust pad including a second plurality of serrations circumferentially arranged in a second pattern along the second thrust pad.

Abstract: Methods and apparatus to provide vortex cooled secondary flow for a supercritical carbon dioxide pump are disclosed herein. An example thermal management system includes a hot secondary flow extract section fluidly coupled to an outlet of a pump system, a cooled secondary flow section fluidly coupled to the hot secondary flow extract section, the hot secondary flow extract section including a vortex tube to generate cooled secondary air flow from hot secondary flow extract air of the hot secondary flow extract section, and a bearing inlet fluidly coupled to the cooled secondary flow section, the bearing inlet positioned to route the cooled secondary flow to bearings of the pump system.

Abstract: Casing waste heat recirculation loops and related methods are disclosed. An example engine includes at least one of a compressor or a pump; a casing for at least one of the pump or the compressor, the casing including a conduit formed in a wall of the casing, the conduit to define a recirculation flow path for a fluid at least partially within the wall of the casing; a valve positioned at an inlet to the recirculation flow path; and an actuator operatively connected to the valve and configured to adjust a position of the valve among at least one of open, partially open, or closed, the valve to allow passage of at least a portion of the fluid when at least one of open or partially open.

Abstract: Apparatus, systems, and articles of manufacture are disclosed to dynamically support axial thrust in pumps. An example apparatus disclosed herein includes a first thrust pad, a second thrust pad, and a thrust disc between the first thrust pad and the second thrust pad, the thrust disc including a first side adjacent to the first thrust pad. a second side adjacent to the second thrust pad, an outer surface, a first channel extending between the outer surface to the first side, and a second channel extending between the outer surface of the thrust disc to the second side.

Abstract: Methods, apparatus, systems, and articles of manufacture are disclosed to reduce failure to bearings in a pump system. Disclosed herein is a pump system comprising a shaft connected to an impeller of the pump system, and a bearing to provide a dampening to the shaft, the bearing including a journal lining, the journal lining supported in the pump system, a spring-loaded foil to separate the shaft from the journal lining, an inner lining between the shaft and the spring-loaded foil, and a deformation limiter located between the spring-loaded foil and the journal lining.

Abstract: Impeller bearings for pumps are disclosed. An example fluid pump includes a motor, a shaft coupled to a rotor of the motor, an impeller coupled to the shaft, a first radial bearing positioned around the shaft of the motor aft of the motor, and a second radial bearing positioned around the impeller.

Abstract: Apparatus, systems, and articles of manufacture are disclosed to power thermal management systems with heat of a working fluid therein. Example thermal management system include: a thermal transport bus loop fluidly coupled to at least one heat source exchanger and at least one heat sink exchanger; a turbomachine including a turbine and a compressor, the turbine and compressor rotatably interlocked via a shaft, the compressor coupled to the thermal transport bus loop, the turbine including an inlet and an outlet, the inlet connected to a first point of the thermal transport bus loop via a first flowline, the outlet connected to a second point of the thermal transport bus loop via a second flowline; and a control valve coupled to the first flowline, the control valve to adjust a mass flowrate of the heat exchange fluid in the first flowline based on a speed of the shaft.

Abstract: Dual compression-expansion pumps and related methods are disclosed. An example fluid pump includes a shaft, a motor coupled to the shaft, the motor to drive a rotation of the shaft, a compressor coupled to a first end of the shaft, a turbine coupled to a second end of the shaft opposite the first end, and a housing including a first inlet, a second inlet, a third inlet, a first outlet, and a second outlet, the first outlet fluidly coupled to the second inlet, the second outlet fluidly coupled to the third inlet.

Abstract: Jet engine thermal transport bus pumps are disclosed. Disclosed herein is an aircraft comprising a gas turbine engine configured to burn fuel at a fuel flow rate to generate an engine power (Pengine), the fuel characterized by a first specific heat capacity (cp_fuel) and a net heat of combustion (NHCfuel); and a thermal management system configured to transfer heat from a working fluid to the fuel, the working fluid characterized by a second specific heat capacity (cp_pump) and a first density (?pump), the thermal management system including a pump configured to generate a pump power (Ppump) to pressurize the working fluid, and wherein P ? O ? W = P p ? u ? m ? p ( c p_pump c p_water ) ? ( ? w ? a ? t ? e ? r ? p ? u ? m ? p ) 2 , F ? F ? R = ( P e ? n ? g ? i ? n ? e N ? H ? C f ? u ? e ? l ) ? ( c p_fuel c p_pump ) 0.008?POW/FFR5/3?12, FFR is between 0.

Abstract: Apparatus, systems, and articles of manufacture are disclosed to dynamically support axial thrust in pumps. Examples disclosed herein include a thrust bearing system including a thrust disc coupled to an impeller shaft; a first thrust pad coupled to a body of the pump, the first thrust pad positioned on a forward side of the thrust disc; a second thrust pad coupled to the body of the pump, the second thrust pad positioned on an aft side of the thrust disc; and a spring-loaded assembly integrated into the first and second thrust pads, the spring-loaded assembly connected to a pump outlet via a first flowline, the first flowline to transmit a working fluid from the pump outlet to the forward side of the thrust disc or the aft side of the thrust disc based on a position of the spring-loaded assembly.

Abstract: Apparatus, systems, and articles of manufacture are disclosed to dynamically support axial thrust in pumps. Examples disclosed herein include a thrust bearing system including a thrust disc coupled to an impeller shaft; a first thrust pad coupled to a body of the pump, the first thrust pad positioned on a forward side of the thrust disc; a second thrust pad coupled to the body of the pump, the second thrust pad positioned on an aft side of the thrust disc; and a spring-loaded assembly integrated into the first and second thrust pads, the spring-loaded assembly connected to a pump outlet via a first flowline, the first flowline to transmit a working fluid from the pump outlet to the forward side of the thrust disc or the aft side of the thrust disc based on a position of the spring-loaded assembly.