Analysis of Screen Channel LAD Bubble Point Tests in Liquid Methane at Elevated Temperature

Hartwig, Jason; McQuillen, John

doi:10.2514/6.2012-759

Cited by 16 publications

(11 citation statements)

References 9 publications

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“…Trends here are in excellent agreement with previous bubble point tests in LOX and LCH 4 where similar disparity in performance existed between the autogenous and noncondensible pressurization methods McQuillen 2012a). Unlike LOX and LCH 4 test results however, disparity between GH 2 and GHe in LH 2 is far outside experimental uncertainty.…”

Section: Preliminary Results and Discussionsupporting

confidence: 81%

“…Data reduction for the LH 2 bubble point tests was straightforward. Details are presented in Hartwig and McQuillen (2012a). To compare with theoretical predictions, all experimental bubble point values were corrected for head pressure:…”

Section: Experimental Methodologymentioning

confidence: 99%

“…Third, the gas flow control system was modified to allow slower ramp rates in pressurization beneath the screen. Fourth, to improve upon accuracy of measurements from Hartwig and McQuillen (2012a), dual range high accuracy DPTs were installed to measure the differential pressure across the screen as shown in Figure 7. Fifth, smaller diameter, 3 mm (1/8 in.)…”

Section: Methodsmentioning

confidence: 99%

“…Based on previously reported cryogenic bubble points from McQuillen (2011 and2012a), the model is only valid for normally saturated liquids. Hartwig and Mann (2013b) showed that Equation (1) simplifies to…”

Section: The Bubble Pointmentioning

confidence: 99%

See 3 more Smart Citations

Performance Gains of Propellant Management Devices for Liquid Hydrogen Depots

Hartwig

McQuillen

Chato

2013

51st AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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Section: Preliminary Results and Discussionsupporting

confidence: 81%

Section: Experimental Methodologymentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: The Bubble Pointmentioning

confidence: 99%

See 2 more Smart Citations

Performance Gains of Propellant Management Devices for Liquid Hydrogen Depots

Hartwig

McQuillen

Chato

2013

51st AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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“…1. The pressure dependence on bubble point is believed to be a modification of the temperature dependence [19,20]. Higher pressures relative to the saturation pressure, and thus higher levels of liquid subcooling at the screen, produced higher bubble points for previously reported LOX and LCH 4 data.…”

Section: Liquid Hydrogen Testsmentioning

confidence: 89%

Warm Pressurant Gas Effects on the Static Bubble Point Pressure for Cryogenic LADs

Hartwig

McQuillen²,

Chato³

2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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This paper presents experimental results for the liquid hydrogen and nitrogen bubble point tests using warm pressurant gases conducted at the NASA Glenn Research Center. The purpose of the test series was to determine the effect of elevating the temperature of the pressurant gas on the performance of a liquid acquisition device (LAD). Three fine mesh screen samples (325x2300, 450x2750, 510x3600) were tested in liquid hydrogen and liquid nitrogen using cold and warm non-condensable (gaseous helium) and condensable (gaseous hydrogen or nitrogen) pressurization schemes. Gases were conditioned from 0K -90K above the liquid temperature. Results clearly indicate degradation in bubble point pressure using warm gas, with a greater reduction in performance using condensable over non-condensable pressurization. Degradation in the bubble point pressure is inversely proportional to screen porosity, as the coarsest mesh demonstrated the highest degradation. Results here have implication on both pressurization and LAD system design for all future cryogenic propulsion systems. A detailed review of historical heated gas tests is also presented for comparison to current results. Nomenclatured shute = Diameter of the shute wire [μm] d warp = Diameter of the wap wire [μm] D p = Effective pore diameter [μm] g = Gravitational acceleration [m/s 2 ] HEX = Heat exchanger LL = Liquid Level above LAD screen [m] l s = Distance between consecutive shute wires [μm] n shute = Number of shute wires per inch of screen [1/m] n warp = Number of warp wires per inch of screen [1/m] PCA = Pressure control assembly t = Screen thickness [μm] ΔP BP = Bubble point pressure [Pa] ΔT = Temperature difference between liquid and pressurant gas [K] ε = Porosity γ = Surface tension [mN/m] ρ LH2 = Liquid hydrogen density [kg/m 3 ] θ c = Contact angle [degrees]

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Screen channel liquid acquisition device outflow tests in liquid hydrogen

et al. 2014

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This paper presents experimental design and test results of the recently concluded 1-g inverted vertical outflow testing of two 325x2300 full scale liquid acquisition device (LAD) channels in liquid hydrogen (LH 2 ). One of the channels had a perforated plate and internal cooling from a thermodynamic vent system (TVS) to enhance performance. The LADs were mounted in a tank to simulate 1-g outflow over a wide range of LH 2 temperatures (20.3 -24.2 K), pressures (100 -350 kPa), and flow rates (0.010 -0.055 kg/s). Results indicate that the breakdown point is dominated by liquid temperature, with a second order dependence on mass flow rate through the LAD. The best performance is always achieved in the coldest liquid states for both channels, consistent with bubble point theory. Higher flow rates cause the standard channel to break down relatively earlier than the TVS cooled channel. Both the internal TVS heat exchanger and subcooling the liquid in the propellant tank are shown to significantly improve LAD performance.

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Analysis of Screen Channel LAD Bubble Point Tests in Liquid Methane at Elevated Temperature

Cited by 16 publications

References 9 publications

Performance Gains of Propellant Management Devices for Liquid Hydrogen Depots

Performance Gains of Propellant Management Devices for Liquid Hydrogen Depots

Warm Pressurant Gas Effects on the Static Bubble Point Pressure for Cryogenic LADs

Screen channel liquid acquisition device outflow tests in liquid hydrogen

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