Stage-Separation Aerodynamics of Two-Stage Space Transport Systems Part 2: Unsteady Simulation

2008 ◽  
Vol 45 (6) ◽  
pp. 1240-1250 ◽  
Author(s):  
Mochammad A. Moelyadi ◽  
Christian Breitsamter ◽  
Boris Laschka
Keyword(s):  
Transport Systems ◽  
Two Stage ◽  
Stage Separation ◽  
Unsteady Simulation

Stage-Separation Aerodynamics of Two-Stage Space Transport Systems Part1: Steady-State Simulations

2008 ◽  
Vol 45 (6) ◽  
pp. 1230-1239 ◽  
Author(s):  
Mochammad A. Moelyadi ◽  
Christian Breitsamter ◽  
Boris Laschka
Keyword(s):  
Steady State ◽  
Transport Systems ◽  
Two Stage ◽  
Stage Separation

A new two-stage separation procedure for the IDMS based quantification of low Pd and Pt amounts in automotive exhaust emissions

2015 ◽  
Vol 30 (2) ◽  
pp. 479-486 ◽  
Author(s):  
Jochen Vogl ◽  
Christian Meyer ◽  
Maren Koenig ◽  
Dorit Becker ◽  
Janine Noordmann ◽  
...  
Keyword(s):  
Exhaust Emissions ◽  
Separation Procedure ◽  
Automotive Exhaust ◽  
Two Stage ◽  
Effective Separation ◽  
Stage Separation

A two-step separation procedure for the IDMS-analysis of Pd and Pt was developed enabling effective separation from interfering elements.

scholarly journals The Antarctic Stratospheric Aerosol Observation and Sample-Return System Using Two-Stage Separation Method of a Balloon-Assisted Unmanned Aerial Vehicle

2021 ◽  
Author(s):  
Shin-Ichiro Higashino ◽  
Masahiko Hayashi ◽  
Takuya Okada ◽  
Shuji Nagasaki ◽  
Koichi Shiraishi ◽  
...  
Keyword(s):  
Control System ◽  
Unmanned Aerial Vehicle ◽  
Stratospheric Aerosol ◽  
Separation Method ◽  
Two Stage ◽  
Sample Return ◽  
Stage Separation ◽  
Rubber Balloon ◽  
Aerial Vehicle ◽  
The Antarctic

Abstract. The authors have developed a system for the Antarctic stratospheric aerosol observation and sample-return using the combination of a rubber balloon, a parachute, and a gliding fixed-wing unmanned aerial vehicle (UAV). A rubber balloon can usually reach 20 km to 30 km in altitude, but it becomes difficult for the UAV designed as a low-subsonic UAV to directly glide back from the stratospheric altitudes because the quantitative aerodynamic characteristics necessary for the control system design at such altitudes are difficult to obtain. In order to make the observation and sample-return possible at such higher altitudes while avoiding the problem with the control system of the UAV, the method using the two-stage separation was developed and attempted in Antarctica. In two-stage separation method, the UAV first descends by a parachute after separating from the balloon at stratospheric altitude to a certain altitude wherein the flight control system of the UAV works properly. Then it secondly separates the parachute for autonomous gliding back to the released point on the ground. The UAV in which an optical particle counter and an airborne aerosol sampler were installed was launched on January 24, 2015 from S17 (69.028S, 40.093E, 607 m MSL) near Syowa Station in Antarctica. The system reached 23 km in altitude and the UAV successfully returned aerosol samples. In this paper, the details of the UAV system using the two-stage separation method including the observation flight results, and the preliminary results of the observation and analyses of the samples are shown.

Isotachophoresis with ionic spacer and two-stage separation for high sensitivity DNA hybridization assay

The Analyst ◽  
2013 ◽  
Vol 138 (11) ◽  
pp. 3117 ◽  
Author(s):  
Charbel Eid ◽  
Giancarlo Garcia-Schwarz ◽  
Juan G. Santiago
Keyword(s):  
Dna Hybridization ◽  
High Sensitivity ◽  
Hybridization Assay ◽  
Two Stage ◽  
Stage Separation

scholarly journals Investigation of the Optimum Clocking Position in a Two-Stage Axial Turbine

2005 ◽  
Vol 2005 (3) ◽  
pp. 202-210 ◽  
Author(s):  
Dieter Bohn ◽  
Sabine Ausmeier ◽  
Jing Ren
Keyword(s):  
Flow Field ◽  
Unsteady Flow ◽  
Preliminary Design ◽  
Two Stage ◽  
Axial Turbine ◽  
Sliding Mesh ◽  
Field Distributions ◽  
Unsteady Simulation

A frozen rotor approach in a steady calculation and a sliding mesh approach in an unsteady simulation are performed in a stator clocking investigation. The clocking is executed on the second stator in a two-stage axial turbine over several circumferential positions. Flow field distributions as well as the estimated performances from two approaches are compared with each other. The optimum clocking positions are predicted based on the estimated efficiency from the two approaches. The consistence of the optimum clocking positions is discussed in the paper. The availability and the limit of the frozen rotor approach in predicting the optimum clocking position is analyzed. It is concluded that the frozen rotor approach is available to search the optimum clocking position in the preliminary design period, although it misses some features of the unsteady flow field in the multistage turbines.

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