# Thread: sharp reduction and increase

1. ## sharp reduction and increase

Hi every body

I am working at my project of lesson. and the foolowing figure is related to my project, so I want to explain about the following figure.

As shwon in figure, at K<0.14, parameter of (D) reduces and parameter of (G) increases with decreasing parameter of K .This reduction and increase is sharp.Now I want to explain this subject.

Is the folloing sentences good?

"At k≤0.14, the reason for sharp reduction of D and sharp increase of G could be due to
the high effect of interaction between wake of upstream blade and boundary layer on the suction surface of the blade."

Is usage of "sharp reduction and increase" correct?

Thanks,

Ali

2. ## Re: sharp reduction and increase

I would say "the sharp reduction of D and sharp increase of G"

3. ## Re: sharp reduction and increase

There is no sharp reduction in D at K=0.14. In fact there is a gradual increase from K = 0.16 to 0.20. The sharp reduction starts only at K=0.21.

..the high effect of interaction between the wake of upstream blade and the boundary layer on the suction surface of the blade

4. ## Re: sharp reduction and increase

Originally Posted by tedmc
There is no sharp reduction in D at K=0.14. In fact there is a gradual increase from K = 0.16 to 0.20. The sharp reduction starts only at K=0.21.

..the high effect of interaction between the wake of upstream blade and the boundary layer on the suction surface of the blade

Thanks,

Yes, my mean is by 'wake of upstream blade'.

Your say is correct. But, at K<0.14, there is sharp reduction in D with decreasing K.

In fact, I want to say that effect of 'wake of upstream blade' is increased with decreasing k at K<0.14.

I am grateful that guide me.

Best,

Ali

5. ## Re: sharp reduction and increase

I am having trouble with your analysis of the graph. I agree that at K <0.14 D decreases. However, G increases with an increase in parameter K. It increases as K increases from 0.1 to 0.23.

6. ## Re: sharp reduction and increase

The only change I'd make is adding 'the' as mentioned above, and changing "At k0.14" to "At K < 0.14". Note that it's K, not k.
Obviously you are not analysing anything beyond K = 0.14 in that sentence.

7. ## Re: sharp reduction and increase

You said that I add 'the'. Why?

my mean is the following Phrases:

"the wake of upstream blade and the boundary layer"

"the sharp reduction of D and sharp increase of G"

8. ## Re: sharp reduction and increase

Originally Posted by ali_dd
You said that I add 'the'. Why?
We use articles in English.
http://englishpage.com/articles/index.htm

9. ## Re: sharp reduction and increase

Originally Posted by MikeNewYork
I am having trouble with your analysis of the graph. I agree that at K <0.14 D decreases. However, G increases with an increase in parameter K. It increases as K increases from 0.1 to 0.23.
only I want to explain variation of parameters of G and D at K<0.14 because the reason for this variations is important at this range, But the reason for variation is obvious beyond K = 0.14.

10. ## Re: sharp reduction and increase

Hi friends,

Can I use words of "slop" or "rate" in this subject?

If so, How to apply?

I think that If I use word of "rate", my explanation is better in terms of scientific.

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