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An astronaut in the future☆
An astronaut in the future (Interview of a scientist friend, Kotaro)
What is the reason why I continue to research and the essence of research? By Kotaro
The source of knowledge is experienceThis sentence is Einstein’s one, which expresses the reason why I have researched by now. My dream in the future is being an astronaut.I continue to research because I have a strong thought that I want to go to the space.
I am researching on propeller now. The propeller and the space development. This two are connected by a study, Fluid dynamics. I want to touch the space development a little by researching this. Whatever research you do, what is in its root is curiosity after all.
Wondering “why?” about wonderful things around us, we also try experiencing that and satisfy our curiosity. Gaining experiences anyway and making them our “food”. I think this is the essence of research.
Aim at the space
Aim at the space
Kotaro took part in an event, THE SPAPCE HANGOUT, which is held by JAXA and google and talked with an astronaut, Akihiko Hoshide, who was staying at the International Space Station at the station, and he got his dream that he want to be an astronaut.He visited Kennedy Space Center in the state of Florida 2 years ago and Johnson Space Center in Houston this year. Well, he learned about the importance of chasing the dream by NASA engineers there.
He talked with all his English ability without interpreter. They caught his poor English and gave him advice kindly. Among them, David, who was engaged in Apollo program, said, “When you fail something, it is important that you think hard why you cannot do.” This is the message that encourages him when he gets desperate because his experiments go wrong.
Consider the propeller to give a hint to the dimple By Kotaro
Purpose of research
Why dimple is marked on a golf ball? If applied to the processing of the propeller learn the effect of the dimple, it was thought that it might be to be able to lead to energy conservation, I became a chance to begin this study. Propeller regardless of the land, sea and air, has been widely utilized. Environmental issues and energy conservation is a theme that can not be avoided on to live in the future of the era.By proceeding with this study to understand the flow of air, we want to save energy, serenity, will lead to devising excellent propeller such as an increase in the cooling effect.
Methods and results of research
Create a wind tunnel by taking the flow of air,
to calculate the Reynolds Number
The results of the experiments, the Reynolds number in the wind tunnel experiment, but significant differences were no golf ball and ping pong ball, experiments have taken the flow, could be visualized that is late "stripping" of the golf ball.
Research Methods and results ②
Five processing the model propeller according hypothesis, measured wind speed, to observe the flow of the wind.
Hypothesis ① By attaching the irregularities such as dimples to the propeller, or not to be raising the wind speed.
Hypothesis ② By the special processing to the tips of the
aircraft and nature and it does not raise the wind speed.
Hypothesis ③ Wind to be released from the propeller, would not become
less when the surface area of the propeller is reduced.
Hypothesis ④ If the processing of the propeller curve, the air flows
along the line, powerful and widely do not to send a cold.
Hypothesis ⑤ Processed hypothesis① propeller and by
shallow irregularities (groove) in, reduces air resistance,
or linearity and diffusion of the wind is not to both improved.
Details here. Link touchuu-din.pdf
Details here. Link touchuu-din.pdf
detail here. Link to uchuu-y.pdf
From the graph, we see that the plurality of propeller exceeds the velocity of the normal propeller.
F, who put a notch in the edge 30 cm, O-c and Pa that dug a shallow vertical trench on both sides in the 50cm point is, evenly wind speed is greater at any point, was considered to be a hint of when considering a propeller that was in purpose .
Looking at the flow of air, a propeller that records large wind velocity, it can be seen that a strong linearity when the wind both from the propeller exhaled. Propeller, which records a large wind speed at 50 cm-70㎝ point is, it can be seen that the momentum of the wind is sustained far. On the other hand, propeller wind speed is small, smoke spread quickly, it can be read not arrived vigorously wind in the straight direction.
Looking at the flow of air, a propeller that records large wind velocity, it can be seen that a strong linearity when the wind both from the propeller exhaled. Propeller, which records a large wind speed at 50 cm-70㎝ point is, it can be seen that the momentum of the wind is sustained far. On the other hand, propeller wind speed is small, smoke spread quickly, it can be read not arrived vigorously wind in the straight direction.
Research Methods and results ③
On the basis of the measured wind speed, to determine the air volume of the wind propeller may send, to quantify the performance of the propeller.
Result
The top graph is a graph showing an air flow rate of the propeller airflow for all points exceeds the normal. Air flow rate of 30 cm point, although D-a rubbed the surface with sand was the most common, D-a is because there is less air volume of 70㎝ point, not included in the graph. The calculation of the air flow as well as x-axis, to wind the use of z-axis, the air flow is not only much velocity of one point is large. Evenly the air flow has become many at any point, it was P-c dug shallow O-b the longitudinal trench dug on the back and both sides of O-c, the shallow lateral grooves on both sides.
Experiment
① at the surface of the propeller wind speed, air volume is large, what's going on? To address the visualization by smoke Dimples or shallow lateral groove smoke flows along a machining grooves and holes are made vortex at the point where the air is separated from the propeller It is seen that. This experiment, in order to increase the wind velocity, air flow is desired assess how should flows for air.
② The output (velocity) as well as the input (power) also can be measured, considering the efficiency of the propeller.
③ The back of the propeller (suction side) and to elucidate by experiment the air flow of the relationship between the table (release side).
Consideration
○ The numerical value of the z axis is related to calculation of a capacity.
A diffusivity as well as direct advance may also be necessary to increase
a capacity.
○ The wind velocity was so small that the distance got away from the propeller
but the propeller which dug a ditch of direct advance also existed
in something by which decrease of the wind velocity isn't judged so much
in the propeller which dug a ditch of a curved line. I thought the validity
of the processing using a curved line should be considered more than
this.
○ There was 30 cm of no great difference in the wind velocity of the normal
propeller and the processing propeller at a spot, but the wind velocity
of the processing propeller exceeded so that the distance from the propeller
was far. Since also putting it in the electric fan which would like
to be hit by a wind farther than this, processing on the propeller surface
may be effective.
○ How air should flow to raise the wind velocity by photography in the
propeller surface has begun to be seen. I'd like to pursue this point
and elucidate a relation between a flow and the wind velocity.
○ This study has shown that it's possible to make the wind velocity and
the capacity be raised than the propeller which isn't worked to dig a
ditch appropriate to the propeller surface. I'd like to advance more
studies and pursue the propeller which connects with energy conservation
and environment protection.
This article was written based on interviews with Mr.Kotaro in November 2015.
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