Possible superlattice formation in high-temperature treated carbonaceous MgB2 at elevated pressure

2006 ◽  
Vol 371 (1) ◽  
pp. 88-94 ◽  
Author(s):  
Oliver Tschauner ◽  
Daniel Errandonea ◽  
George Serghiou
Keyword(s):  
High Temperature ◽  
Elevated Pressure

Experimental and kinetic study on laminar flame speeds of ammonia/dimethyl ether/air under high temperature and elevated pressure

2022 ◽  
Vol 238 ◽  
pp. 111915
Author(s):  
Geyuan Yin ◽  
Jinglun Li ◽  
Meng Zhou ◽  
Jiaxing Li ◽  
Chaojun Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Kinetic Study ◽  
Dimethyl Ether ◽  
Laminar Flame ◽  
Elevated Pressure

Large Eddy Simulation Study of Flow Dynamics in a Multiswirler Model Combustor at Elevated Pressure and High Temperature

2019 ◽  
Vol 11 (6) ◽  
Author(s):  
Weijie Liu ◽  
Qian Yang ◽  
Ranran Xue ◽  
Huiru Wang
Keyword(s):  
High Temperature ◽  
Large Eddy Simulation ◽  
Elevated Pressure ◽  
Dominant Frequency ◽  
Flow Dynamics ◽  
Main Stage ◽  
Eddy Simulation ◽  
Precessing Vortex Core ◽  
Flow Interaction ◽  
Large Eddy

Large eddy simulation (LES) of nonreacting turbulent flow in a multiswirler model combustor is carried out at elevated pressure and high temperature. Flow interaction between the main stage and the pilot stage is discussed based on the time-averaged and instantaneous flowfield. Flow dynamics in the multiswirling flow are analyzed using a phase-averaged method. Proper orthogonal decomposition (POD) is used to extract dominant flow features in the multiswirling flow. Numerical results show that the main stage and the pilot stage flows interact with each other generating a complex flowfield. Flow interaction can be divided into three regions: converging region, merging region, and combined region. A precessing vortex core (PVC) is successfully captured in the pilot stage. PVC rotates with a first dominant frequency of 2756 Hz inducing asymmetric azimuthal flow instabilities in the pilot stage. POD analyses for the velocity fields also show dominant high-frequency modes (mode 1 and mode 2) in the pilot stage. However, the dominant energetic flow is damped rapidly downstream of the pilot stage such that it has a little effect on the main stage flow.

Laboratory Methods for Scale Inhibitor Selection for HP/HT Fields

2014 ◽  
Author(s):  
J. K. Daniels ◽  
I.. Littlehales ◽  
L.. Lau ◽  
S.. Linares-Samaniego
Keyword(s):  
High Temperature ◽  
Dynamic Performance ◽  
Performance Testing ◽  
Elevated Pressure ◽  
Thermal Ageing ◽  
Scale Inhibitor ◽  
Prediction Modeling ◽  
And Performance ◽  
Scale Control ◽  
Work Done

Abstract HPHT (high pressure, high temperature) conditions create challenges and push the limits of existing technology (i.e., scale prediction modeling, testing methodology and instrumentation) and commercial scale inhibitor chemistry. Scale prediction modeling often fails at HPHT conditions and laboratory testing under appropriate field conditions have to be compromised due to instrument limitations. This paper details work done under high temperature (204°C) and elevated pressure (3,000 psi) conditions in in order to obtain effective scale control. More specifically, this paper will discuss selection methods for continuous and squeeze scale inhibitor application via dynamic performance testing and coreflood studies for scale control in this deep-water oil production field. The technical challenges encountered such as matching the scale type predicted in the prediction software to the scale observed during dynamic tube blocking will be outlined. Thermal ageing procedures/performance testing for continual injection chemicals and performance testing of coreflood effluent from HT coreflood studies will be outlined.

Effect of hydrogen blending on the high temperature auto-ignition of ammonia at elevated pressure

Fuel ◽  
2021 ◽  
Vol 287 ◽  
pp. 119563
Author(s):  
Jundie Chen ◽  
Xue Jiang ◽  
Xiaokang Qin ◽  
Zuohua Huang
Keyword(s):  
High Temperature ◽  
Elevated Pressure ◽  
Auto Ignition
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