Predicted and Experimented Acceleration Profile of the Rocket Sled

Nakata, Daisuke; Kozu, Ami; Yajima, Jun; Nishine, Kenji; Higashino, Kazuyuki; Tanatsugu, Nobuhiro

doi:10.2322/tastj.10.ta_1

Cited by 3 publications

(4 citation statements)

References 6 publications

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“…We used a rocket sled propulsion module which consists of four hybrid motors, a single run-tank and a main valve. 6,7) Figures 1 and 2 show the side view and the piping diagram of the flow test. A photo of the flow test is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

N<sub>2</sub>O Flow History Prediction in an Oxidizer Feed Line of Hybrid Rockets

Nakata

Yasuda

Okada

et al. 2018

AEROSPACE TECHNOLOGY JAPAN

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Nitrous oxide is in a gas-liquid equilibrium state at room temperature, and its vapor pressure is very useful concerning devices such as a pressure-fed hybrid rocket engine systems. However, it is not easy to estimate the flow history of the equilibrium flow. The vapor pressure and the latent heat of the vaporization of nitrous oxide strongly depend on its temperature. Though many models have been proposed, we used a simple equilibrium model and examined important parameters and negligible parameters considering experimental results. Experimental results displayed a substantial difference between the top and bottom tank temperatures, and that the tank pressure greatly matched the saturated vapor pressure at the liquid-phase temperature. A simple analysis showed that the determination of initial temperature was the most important factor and the heat transfer from the tank wall to the nitrous oxide was negligible.

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Section: Methodsmentioning

confidence: 99%

N<sub>2</sub>O Flow History Prediction in an Oxidizer Feed Line of Hybrid Rockets

Nakata

Yasuda

Okada

et al. 2018

AEROSPACE TECHNOLOGY JAPAN

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“…5 An alternative approach to the study of high-speed ground-effect aerodynamics experimentally is via rocket sled methods. 12 In the work of Nakata et al 13,14 using Japan's high-speed test track facility, it was possible to achieve speeds up to Mach 0.6, placing the studies into the compressibility regime but falling short of the critical Mach number. The vast majority of higher speed rocket sled test tracks are located at military installations (e.g.…”

Section: Literature Review: High-speed Ground-effect Aerodynamicsmentioning

confidence: 99%

On the subsonic and low transonic aerodynamic performance of the land speed record car, Bloodhound LSR

Evans

Townsend

Hassan

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part G:

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The land speed record vehicle, Bloodhound, undertook testing at subsonic and low transonic speeds (up to Mach 0.8) at Hakskeen Pan, South Africa, during October and November of 2019. A decade of CFD-led aerodynamic design had been undertaken to produce a vehicle with the aim of minimised Mach number aerodynamic dependencies and minimised overall drag. This paper sets out and explains the measured pressure distributions with a focus on the highest speed run of Bloodhound up to a peak speed of 628 mile/h. It compares the measured aerodynamic performance with the various CFD model predictions used throughout the design process showing that, whilst localised discrepancies between CFD model and real behaviour exist, overall the Reynolds-averaged Navier–Stokes (RANS)-based CFD tools used to design the car did result in sufficiently accurate aerodynamic data to predict the overall vehicle performance to a high degree of accuracy. The work outlined in this paper, and the conclusions and recommendations drawn, form the basis for a future record attempt and the understanding of what will be required in principle to extend the World Land Speed Record to 1000 mile/h. It also provides guidance on how to effectively make use of RANS-based CFD modelling predictions for other complex, ground-interacting high-speed applications.

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“…This facility is opened to the researchers of another university or research organization. Although the detail of this facility is described in our previous reports 2,3) , this paper especially focuses on the onboard balance system equipped on the rocket sled.…”

Section: High Speed Test Track Facilitymentioning

confidence: 99%

“…The sled was propelled by 4 hybrid rockets along the 300 m-long rail track and decelerated by water braking system. The detail of propulsion and braking system is written in our past reports 2,3) . Total weight at the experiment was 150-200 kg including propulsion system, balance, test models and counter weights.…”

Section: Test Platformsmentioning

confidence: 99%

Aerodynamic Measurement on the High Speed Test Track

Nakata

Nishine²,

Tateoke

et al. 2014

AEROSPACE TECHNOLOGY JAPAN

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This paper describes onboard balance system used in the rocket sled test on the high speed test track. Newly developed acceleration-compensated balance mechanically cancels inertia force and enables us to use suitable size load cells for expected aerodynamic force. Lift force was evaluated by another internal 6-axis balance. With a flat plate and AGARD-B model, system verification tests were conducted to clear the accuracy of this system. Although the cancellation of the onboard G-force was almost accomplished, uncertainty of the wind speed or mechanical friction in the system caused severe error to the measured drag coefficient.

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Predicted and Experimented Acceleration Profile of the Rocket Sled

Cited by 3 publications

References 6 publications

N<sub>2</sub>O Flow History Prediction in an Oxidizer Feed Line of Hybrid Rockets

N<sub>2</sub>O Flow History Prediction in an Oxidizer Feed Line of Hybrid Rockets

On the subsonic and low transonic aerodynamic performance of the land speed record car, Bloodhound LSR

Aerodynamic Measurement on the High Speed Test Track

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