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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 34 for “"Piston cylinder"”.
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Numerical modeling of piston secondary motion and skirt lubrication in internal combustion engines
… project aims to develop a numerical model of piston dynamics and lubrication in internal combustion engines, enabling prediction of friction generation at the piston -cylinder bore interface, and oil transport in the power cylinder system. It is currently estimated that the piston - cylinder …
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Modeling Unburned Hydrocarbon Formation Processes in Internal Combustion Engines
… (1) HC vapor absorption and/or desorption into cylinder wall oil film; (2) flow of unburned mixture into piston-cylinder-ring crevices; and (3) fuel-air overmixing and/or under-mixing leading to unstable or incomplete combustion.
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Development of a floating piston expander control algorithm for a Collins-type cryocooler
… Collins-type cryocooler uses a floating piston design for the working fluid expansion in each stage. The piston floats between a cold volume, where the working fluid is expanded, and a warm volume. The piston's motion is controlled by opening and closing valves connecting several …
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Reciprocating compressor lubrication – lubricant dilution with natural gas species and the impact on lubrication rates at various operating conditions
… lubricants to reduce friction and wear at the piston-cylinder interface. These lubricants have a difficult job for many reasons, but one phenomenon is often overlooked: gas solubility. Natural gas is soluble in the lubricant at high pressures and mixes with, or dilutes, the lubricant. Recent …
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The effect of pressure and temperature on the microstructure and mechanical properties of polycrystalline graphites
… of about 3 GPa at room temperature (in a piston-cylinder device – PC condition) and (3) after exposure to temperatures of about 1500°C at pressures of about 5.5 GP a (high temperature- high pressure, or HTHP, condition). Their microstructures have been compared on the basis of X-ray …
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Miniature HCCI Engine Compressor
… miniature robotics. A prototype miniature free-piston engine compressor runs for up to 30 s. New pistons and cylinder liners with coatings did not improve reliability when implemented in the engine. The engine stalled because pressure could not be held in the cylinder due to blow-by leakage …
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Phase equilibrium investigations of the Adirondack Class basalts from the Gusev plains, Gusev crater, Mars
… and at temperatures from 1105 °C to 1390 °C in a piston cylinder apparatus and l-atm gas mixing furnace. The composition is multiply saturated with olivine, orthopyroxene, and spinel on the liquidus at 1310 °C and 1.0 GPa, or 85 km depth on Mars, placing an upper limit constraint on the thickness …
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Calculation of gas-wall heat transfer from pressure and volume data for spaces with inflow and outflow
Heat transfer in cylinder spaces is important to the performance of many reciprocating energy conversion machines, such as gas compressors and Stirling machines. Work over the past 10 years has shown that heat transfer driven by oscillating pressure differs from steady state heat transfer, in …
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Absarokites from the Western Mexican Volcanic Belt : constraints on mantle wedge conditions
… either -1 7 wt% or -5.1 wt% were cared out in a piston cylinder apparatus. The composition with -1.7 wt% H2O is multiply saturated with olivine and orthopyroxene as liquidus phases at 1.6 GPa and 1400°C. At the same pressure clinopyroxene appears 30°C below the liquidus. With a H2O content of …
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The Design and Construction of a Bulge Testing Device Platform for Human Skin Tissue Applications
… respectively to initially specify a modifiable piston-cylinder bulge testing apparatus, and to design a customisable discrete proportional-integral closed-loop feedback pressurisation rate control system and software control environment. Pressure-time histories were successfully collected and …
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Absarokites from the Western Mexican Volcanic Belt : constraints on mantle wedge conditions
… -1.7 wt% or -5.1 wt% were carried out in a piston cylinder apparatus. The composition with -1.7 wt% H20 is multiply saturated with olivine and orthopyroxene as liquidus phases at 1.6 GPa and 14000C. At the same pressure clinopyroxene appears 300C below the liquidus. With a H20 content of …
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Development of High-Pressure Calorimetry Techniques and Calorimetry Study of the Heavy-Fermion Superconductor CeSb2
… the situation of materials at high-pressure in a piston cylinder cell, comparing various possible measurement strategies. Detailed calculations of the thermodynamic variables pave the way for further development and optimisation for future projects studying materials under pressure and beyond. We …
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Water solubility in diopside
… diopside crystals were synthesized using piston-cylinder and multi-anvil presses at 20-30 and 100 kbar and 800-1100oC from an oxide and hydroxide starting mixture containing 10 % excess silica. The water concentration in diopside was determined from polarized infrared measurements on …
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Experimental investigation into lunar melt density and compressibility : the role of titanium
… on these lunar glass compositions using a piston-cylinder apparatus (P < 2 GPa) and Walker-style multi-anvil device (P > 2 GPa) in order to bracket the density of these melts. We report new sink-float data for A15C, A14Y, and A17O. We find that with increasing pressure, the melts with less …
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Metal-insulator transition in yttrium- and neodymium-doped lanthanum nickelates
… or high quasi-hydrostatic pressures using a hot piston-cylinder apparatus (2.0 − 2.5 GPa) with an oxidizer at high temperatures (900°C − 1000°C) for La₁₋ₓYₓNiO₃ (x > 0.2). These compounds can be reduced several ways to produce the infinite-layer phase, as well as some other RₙNiₙOᵧ phases (e.g., …
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Elasticity and phase transitions of stishovite and NaCl at high pressure
… were performed in Merrill-Bassett and piston-cylinder types of diamond anvil cells with Ne, KBr, NaCl, Ar, N2, silicone oil, and a ethanol-methanol-water mixture as pressure transmitting media up to 78 GPa at 300K.
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Water in the Earth’s Interior: Thermodynamics and kinetics of hydrogen incorporation in olivine and wadsleyite
… performed at 1.5 GPa, 1000°C for 5 hours in a piston cylinder apparatus, or at 0.2 GPa, 900°C, for 1 and 20 hours in TZM cold-seal vessels. Polarized Fourier-transform infrared spectrometry (FTIR) was employed to quantify the hydroxyl distributions in the samples after the experiments. The new …
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Analysis and mitigation of key losses in a multi-stage 25-100 K cryocooler
… cryocooler will use computer-controlled floating piston expanders to simultaneously provide 20 and 100 Watts of cooling at 25 and 100 K, respectively. The contributions in this thesis can be divided into two broad categories. The first is concerned with the systems-level efficiency of the …
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Measurements of in-cylinder heat transfer with inflow-produced turbulence
Heat transfer in cylinder spaces is important to the performance of many reciprocating energy conversion machines, such as gas compressors and Stirling machines. Work over the past 10 years has shown that heat transfer driven by oscillating pressure differs from steady state heat transfer in …
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Excess Volume and Exsolution in Pyrope-Grossular Garnet
… from garnet hydrothermally synthesized in piston cylinder apparatus. The binary Margules equation used to fit this excess volume data gives parameters 𝑊_𝘝𝘨𝘳𝘰𝘴𝘴𝘶𝘭𝘢𝘳 = 2.0±0.1 cm³/mol, which is about half as big as 𝑊_𝘝𝘗𝘺𝘳𝘰𝘱𝘦 = 4.3±0.1 cm³/mol. Garnets synthesized in diamond anvil cells (DAC) …
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