A fuel enhancement method and system for supplying the engine with a pressurized fuel mixture comprising a mixture of the liquid fuel and the gaseous component including provisions to maintain the ratio of gas to liquid in the mixture at a predetermined value and maintain the pressure of the fuel mixture applied to the engine at a predetermined value. A system using variable speed drive pumps is disclosed.

In some aspects, an oxidizer tank having an inner volume, the inner volume of the tank having an ullage portion and volume portion containing liquid nitrous oxide. A helium injection line may extend from an entry point of the oxidizer tank to a distal end at a location within the oxidizer portion of the tank. The apparatus may include a diffuser affixed to the distal end of the helium injection line, the diffuser having a plurality of apertures. In addition, when helium gas is supplied to the oxidizer tank via the helium injection line, the helium is injected into the liquid nitrous oxide through the diffuser, causing evaporation of a portion of the liquid nitrous oxide thereby forming nitrous oxide gas. The injected helium and the nitrous oxide gas rise to the surface of the liquid nitrous oxide into the ullage increasing pressure in the ullage.

A bearing scavenge pump incorporated into a disk cover plate including a rotor disk having a rear surface and an axis; the disk cover plate attached to the rotor disk, the disk cover plate including fins extending into a gap formed between a rear surface of the rotor disk and the disk cover plate, the disk cover plate including anti-vortex features located axially distal from the fins relative to the axis; an inverted bearing located in a bearing compartment proximate the disk cover plate and disk; and a liquid fuel lubricant contacting the inverted bearing.

LNG cold power generator includes: a working fluid including carbon dioxide and ethane; a pump; an evaporator; a turbine; and a condenser. A molar ratio of the carbon dioxide and the ethane is 8595:15:0.5. The working fluid is used in a closed Rankine cycle. A supply pressure of supplied LNG is adjusted to a pressure at which it becomes a saturated liquid. A temperature at an outlet of the condenser is adjusted to a saturated vapor temperature of LNG. A pressure at an outlet of the pump is adjusted to a critical pressure of a mixed working fluid. The cycle includes two turbines and a heater provided therebetween. The heater heats the working fluid to prevent condensation thereof.