Chamber pressure

About: Chamber pressure is a research topic. Over the lifetime, 2988 publications have been published within this topic receiving 30725 citations.

High Flow Volume Nasal Irrigation Device and Method for Alternating Pulsatile and Continuous Fluid Flow

Abstract: A high flow volume nasal irrigation device for alternating pulsatile and continuous fluid flow includes a segmented dip tube with a free end extending inside a squeeze bottle configured to convey a liquid under an elevated chamber pressure from a reservoir therein to a lower pressure outside the bottle. The device also includes an elastic segment at the free end of the tube configured to oscillate about a bending in the segment in response to a differential pressure between an internal pressure and the chamber pressure, the segment having an elastic restoring force in opposition to the bending. The disclosed device further includes a pulsatile portion of the elastic segment configured to close at the segment bending and to reopen under the elastic restoring force and to thus generate a periodic pulsatile fluid flow through the tube with a period corresponding to the elastic segment oscillation.

Simple model of the plasma torch developed for application to an arc-plasma waste-treatment system

Abstract: A simple theoretical model describing physics of the plasma torch plume is developed in connection with its applications to the arc-plasma waste-treatment system. The theoretical analysis is carried out by making use of Bernoulli's pressure-balance equation, which provides a stable equilibrium solution of the gas density in the plume ejected from the torch into a high-pressure reactor chamber with 4e 1, there is no stable equilibrium solution satisfying Bernoulli's equation. Therefore, it is expected that the observable plasma data may change abruptly as the chamber pressure crosses the borderline defined by 4e = 1. Indeed, most of the plasma data measured in an experiment change abruptly at the pressure borderline of 4e = 1. The oxygen torch plume is theoretically analyzed for the arc-plasma waste-treatment system...

Combustion Dynamics and Stability of a Fuel-Rich Gas Generator

Abstract: The dynamic characteristics of fuel-rich combustion have been studied using an experimental combustor simulating a gas generator for a liquid rocket engine. The combustor burns liquid oxygen and fuel (Jet A-1) at a mixture ratio of about 0.32 and a chamber pressure ranging from 4.10 to 7.24 MPa, which covers subcritical to supercritical pressures of oxygen. For the investigation of combustion dynamics, pressure fluctuation measurements using piezoelectric sensors have been a major probe throughout the present study. Two different types of injector heads equipped with biliquid swirl coaxial injectors and either a short nozzle or a turbine manifold nozzle have been used in the study. Fuel-rich combustion of both injector heads with the short nozzle revealed pressure pulsation at frequencies of about 128 Hz, which attenuates along with an increase of a chamber pressure. Combustion tests with the turbine manifold nozzle conducted at chamber pressures lower than the oxygen critical pressure showed combustion instabilities at a frequency of 330 Hz, which has been identified as a longitudinal resonant mode by a linear acoustic analysis. The combustion instabilities seem to be induced by inherent pressure fluctuations from the biliquid swirl coaxial injector when the chamber pressure is below the oxygen critical pressure.

Turbulent Transport in Rocket Motor Unsteady Flowfield

Abstract: Nomenclature Ab = pressure coupling admittance function Ay = velocity coupling admittance function #o = mean speed of sound er,eo,ez = unit vectors in r, 0, and z directions E^ = normalization constant for mode m km = wave number for axial mode m L chamber length m = mode number Mb = mach number at burning surface n outward pointing unit normal vector p = pressure PQ = mean chamber pressure r = radial position R = chamber radius S = Strouhal number, km/Mb t = time t = unit vector tangent to burning surface u oscillatory velocity vector amplitude Ur,Uz = mean flow velocity components Vb = mean radial velocity at wall

Process and apparatus for the treatment of tobacco material

Abstract: Process and apparatus for the treatment of tobacco material and other biological materials includes a mechanism comprising a dynamic seal having components having cooperating movable surfaces for sealing a treatment chamber that substantially prevents the passage of fluid at the treatment chamber pressure during movement of the components for introducing material into and removing material from the chamber. The seal components preferably comprise advanced structural ceramic components having a hardness of at least 900 kg/mm 2 and a flatness of at least 70 microinches. The process is preferably conducted at supercritical gaseous conditions.