Diesel Progress North American

Along with the high pressure, the PressureMAX blade
profile is also five to seven percent-points more efficient
than typical airfoil blade designs, the company said, which
reduces parasitic loss and helps improve fuel economy.
“One of the things we discovered when we got into
this process is that we had to address power consump-
tion through entirely new designs,” said James J. Crowley

“When we started this, we were looking to really find out
what Tier 4 was going to mean to us as a fan producer,”
said Bernhoft. “We quickly realized that this was going to
challenge us more than anything else ever had. Tier 3 was
really more about noise emissions and there were solu-
tions that were already in the market that were open to us.
“This time, we really had to start from scratch because it
became clear we weren’t going to be able to reach it with
standard technology. We really had to stretch ourselves.
“We found out when we started working that this was only
the beginning — there was much more to come for us, using
these techniques. So Tier 4 is helping us move forward and
break some of the barriers that had confronted us.”
The key aspect of PressureMAX is a blade design engi-
neered to deliver 20% more pressure than a standard air-
foil fan at normal engine speeds. “The whole thing is about
getting more pressure,” said Toni Stannov, R&D engineer
at Multi-Wing International. “The radiator and intercooler
and other coolers are all stacked, meaning that you have
higher pressure in the cooling section. Of course, you also
have to look at better efficiency because that’s part of Tier
4 and how you reduce the emissions.
SEE DIRECTLINK WWW.DIESELPROGRESS.COM
CumminsWestport.indd 1 5/13/11 9:29:11AM
“We addressed that by looking into the details of how the
fan works, looking more closely to the aerodynamics. Fan
design has been very traditional for many years and this is
kind of breaking the rule in that it was looking more into the
fundamental aerodynamics.
Precision Safety Screens
“What we learned is that you can easily throw away
good energy without even noticing what’s going on. But
by means of very advanced flow measurement techniques
— we were using data sets based on 24 million samples
taken at a high data rate — we were able to go into detail
and look at every little section of the blade and see how it
performed, how much energy is wasted, and in what way
is it wasted.”

INDUSTRIAL MICROHYDRAULICS

Lee Self-Retaining Screens Protect
Components from Rogue Contamination

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Innovation in Miniature

continued on page 48

COOLING
Multi-Wing’s new
PressureMAX fans
will be offered in
5- to 16-blade con-
figurations in diam-
eters from 24. 5 to
51 in.

The ISL G natural gas engine delivers reliable power, performance, and lower total fuel costs, while meeting EPA 2010 emissions standards without the use of particulate filters or SCR. Factory built by Cummins, the ISL G is available as an option from leading truck and bus manufacturers (CNG or LNG). Quiet, dependable, clean—the ISL G delivers.