CA2579387A1 - Rotor blade for a ninth phase of a compressor - Google Patents

Rotor blade for a ninth phase of a compressor Download PDF

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Publication number
CA2579387A1
CA2579387A1 CA002579387A CA2579387A CA2579387A1 CA 2579387 A1 CA2579387 A1 CA 2579387A1 CA 002579387 A CA002579387 A CA 002579387A CA 2579387 A CA2579387 A CA 2579387A CA 2579387 A1 CA2579387 A1 CA 2579387A1
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Prior art keywords
blade
rotor
profile
compressor
height
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Granted
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CA002579387A
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French (fr)
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CA2579387C (en
Inventor
Alessio Novori
Paolo Arinci
Salvatore Lorusso
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Nuovo Pignone SpA
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Individual
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/32Rotors specially for elastic fluids for axial flow pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/32Rotors specially for elastic fluids for axial flow pumps
    • F04D29/321Rotors specially for elastic fluids for axial flow pumps for axial flow compressors
    • F04D29/324Blades
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/32Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38Blades
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/66Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/666Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)

Abstract

The invention relates to a blade (10) of a rotor of a ninth phase of a compressor, which can be defined by coordinates of a discreet combination of points, in a Cartesian reference system (X,Y,Z), wherein the axis (Z) is a radial axis intersecting the central axis of the compressor, said blade (10) having a profile which can be identified by means of a series of closed intersection curves between the profile itself and planes (X,Y) lying at distances (Z) from the central axis, said blade (10) also comprising a thickening (30), substantially parallel to a base portion (12) of the blade (10) itself, fixable to said rotor, said thickening (30) being substantially situated half-way up the blade (10) and being suitable for shifting the natural resonance frequencies of the blade (10) itself outside a functioning frequency range of said rotor.

Description

ROTOR BLADE FOR A NINTH PHASE OF A COMPRESSOR

The present invention relates to a blade of a rotor of a ninth phase of a compressor.
More specifically, the invention relates to a blade of a rotor having a high aerody-namic efficiency of a ninth phase of a compressor.

Compressors normally pressurize in their interior air removed from the outside.
The fluid penetrates the compressor through a series of inlet ducts.

In these channels, the gas has low pressure and low temperature characteristics, whereas as it passes through the compressor, the gas is compressed and its tempera-ture increases.

In order to increase the efficiency, the compressor is normally divided into various phases, each of which has a rotor and a stator respectively equipped with a series of blades.

In recent years, technologically advanced compressors have been further improved, obtaining an increased improvement in efficiency, operating in particular on the aero-dynamic conditions.

The geometric configuration of the blades in fact significantly influences the aerody-namic efficiency.

This depends on the fact that the geometric characteristics of the blade cause a distri-bution of the relative velocities in the fluid, consequently influencing the distribution of the limit layers along the walls and, ultimately, losses due to friction.

In particular, in the case of rotor blades of a ninth phase of a compressor an extremely high efficiency is required, at the same time maintaining an appropriate aerodynamic and mechanical load.

An objective of the present invention is to provide a blade of a rotor of a ninth phase of a compressor which avoids or in any case reduces resonance problems due to flex-ural vibrations which reduce the life of the component, and at the same time allow a high aerodynamic efficiency.

A further objective of the present invention is to provide a rotor of a ninth phase of a compressor which allows a high aerodynamic efficiency and at the same time allows a high reliability of the compressor to be obtained with a consequent increase in the power of the turbine itself with the same compressor dimensions.

These objectives according to the present invention are achieved by providing a rotor blade of a ninth phase of a compressor as specified in claim 1.

Further characteristics of the invention are indicated in the subsequent claims.

The characteristics and advantages of a rotor blade of a ninth phase of a compressor according to the present invention will appear more evident from the following illus-trative and non-limiting description, referring to the enclosed schematic drawings in which:

figure 1 is a raised view of a rotor blade of a compressor produced with an aerody-namic profile according to the present invention;

figure 2 is a raised view of the opposite side of the blade of figure 1; and figure 3 is a diagram of the maximum thickness trend of a blade according to the pre-sent invention, with respect to its height.

With reference to the figures, a blade 10 is provided of a rotor of a ninth phase of a compressor.

Said blade 10 is defined by means of coordinates of a discreet combination of points, in a Cartesian reference system (X,Y,Z), wherein the axis (Z) is a radial axis inter-secting the central axis of the compressor, not shown.

The profile of the blade 10 is identified by means of a series of closed intersection curves between the profile itself and planes (X,Y) lying at distances (Z) from the cen-tral axis.

The profile of said blade 10 comprises a first substantially concave surface 3, whicli is pressurized, and a second substantially convex surface 5 which is in depression and opposite the first.

The two surfaces 3, 5 are continuous and joined to each other, and together form the profile of said blade 10.
At a base portion 12, commonly called "foot" of the blade 10, according to the known art there is a connecting joint with the aerodynamic profile of the blade 10 itself, said base portion 12 being suitable for being fixed to said rotor of said compressor.

Said blade 10 comprises a thickening 30, i.e. a prolonged portion having a greater thickness with respect to the adjacent portions, which is substantially parallel to said base portion 12 so as to shift the resonance frequencies of said blade 10 outside a functioning frequency range of the rotor itself, thus reducing or in any case avoiding problems of instability and vibrations of the blade 10 and rotor.

This advantageously leads to an increase in both the useful life and reliability of the rotor and compressor itself.

Said thickening 30 relates to at least one section or closed curve, and is also situated half-way up the blade 10.

In other words, said thickening 30 confers a dynamic behaviour to said blade which is such as to have flexural frequencies which fall outside a functioning velocity range of the rotor of said compressor and consequently such that there is no intensification of the maximum flexural deformation of the blade during the functioning of the com-pressor.

This consequently leads to a higher performance of the compressor, of the rotor and a longer useful life of its components, as problems of resonance such as those described above are avoided.

The clearances and tolerances of the blade and stator can therefore be dimensioned so as to further increase the performances of the compressor itself.

This is possible as the blade 10 is prevented, upon deforming, from causing a contact and relative friction against the relative stator.

In particular, each closed curve has a maximum thickness determined by the maxi-mum distance between said first surface 3 and said second surface 5.

Said maximum surface of each closed curve, along the height of the blade 10, moving towards a free end 14 of the blade 10, has first a decreasing and then an increasing trend, followed again by a decreasing and finally increasing trend, with two different slopes, said blade 10 comprising a further thickening substantially parallel to said base portion 12 and situated in particular close to said free end 14.
For example, the variation in the trend of the maximum thickness is shown in figure 3, in which it is compared with the maximum thickness trend of a blade according to the known art. In particular, in figure 3, the abscissa indicates the height of the blade 10, whereas the ordinate represents the maximum thickness of the blade 10, adimension-alized by putting the thickness in correspondence with the foot of the blade equal to 1.
In the diagram shown in figure 3, the lower line represents the maximum thickness trend of a blade according to the known art, whereas the upper line shows the trend of the maximum thickness of the blade according to the present invention.

Along the height of the blade 10 in the direction of a free end 14 of the blade 10, said maximum thickness preferably has a trend which can be described by four different mathematical functions, identifying four different regions of the blade.

In the first region, that closest to the blade 10, up to a height equal to 45%
of the height of the blade, the maximum thickness trend can be described by a polynomial function of the fourth degree (first decreasing and subsequently increasing) and in particular said polynomial function is:

Tmax =-34.522*h4 + 36.4*h3 - 8.4113*h2 - 0.7259*h + 0.9961 wherein h represents the percentage of the height of the blade 10, and wherein Tmax is the maximum adimensionalized thickness relating to that closed curve correspond-ing to that percentage of the height of the blade 10.

In the subsequent region, ranging from 45% to 58% of the height of the blade 10, the thickness varies according to the linear function (decreasing):

Tmax = -1.3509*h + 1.4459 Therefore, between 58% and 86% of the height of the blade 10, the thickness trend is represented by the linear function (increasing):

Tmax = 0.2074*h + 0.5443 Finally, between 86% and the free end 14 of the blade, the maximum thickness varies according to the linear function (increasing):

Tmax = 0.9058*h - 0.0518 The profile of each blade 10 was also suitably shaped to be able to maintain the same efficiency at high levels.
The aerodynamic profile of each blade 10 is preferably defined by means of a series of closed curves whose coordinates are defined with respect to a Cartesian reference system X, Y, Z, wherein the axis Z is a radial axis intersecting the central axis of the turbine, and said closed curves lying at distances Z from the central axis are defined according to Table I, whose values, expressed in millimeters, refer to an aerodynamic profile at room temperature, in particular 25 C.
Table I

X Y Z -5.155 4.25 255.99 -8.852 9.902 255.999 -4.688 3.638 255.99 -8.847 5.9991 -4.19 3.00 255.999 -8.835 9.905 255.99 -3.66 2.36 255.99 -8.812 9.901255.99 -3.09 1.711255.99 -8.771 9.880255.999 -2.52 1.06 255.99 -8.717 9.833 255.99 -1.933 0,30278 255.99 -8.632 9.734 255.99-1.338 -0.189255.99 -8.533 9.59 255.99 -0.735 -0.806255.99 -8.41 9.40 255.999 -0.12 -1.417255.99 -8.263 9.152 255.999 0,33958 -2.023 255.99 -8.08 '8.826 255.99 1.108 -2.62 255.999 -7.871 8.44 255.99 1.732 -3.21 255.99 -7.643 8.05 255.99 2.362 -3.80 255.99 -7.382 7.603 255.999 2.995 -4.395 255.99 -7.086 7.110255.999 3.631 -4.978 255.99 -6.751 6.573255.99 4.249 -5.538255.999 -6.39 6.01 255.99 4.84 -6.075 255.99 -6.005 5.448 255.99 5.432 -6.588 255.99 -5.593 4.86 255.999 5.998 -7.077 255.99 6.545 -7.543 255.999 9.561 -10.857255.999 7.075 -7.986 255.999 9.318 -10.717 255.999 7.586 -8.405 255.99 9.034 -10.552 255.999 8.056 -8.784 255.999 8.697 -10.359255.999 8.485 -9.124255.999 8.308 -10.13 255.999 8.871 -9.424255.999 7.867 -9.884255.999 9.214 -9.685 255.999 7.376 -9.600 255.999 9.515 -9.908 255.99 6.835 -9.282 255.999 9.771 -10.093 255.99 6.245 -8.931255.999 9.992 -10.24 255.99 5.633 -8.55 255.99 10.17 -10.37 255.99 4.99 -8.165 255.99 10.332 -10.485 255.99 4.344 -7.748 255.999 10.426 -10.60 255.999 3.670 -7.305 255.99 10.461 -10.708 255.999 2.977 -6.837 255.999 10.465 -10.793 255.999 2.267 -6.341255.999 10.452 -10.86 255.999 1.543 -5.81 255.99 10.432 -10.917255.999 0,5763 -5.280255.99 10.411 -10.955255.999 0,08958 -4.73 255.999 10.385 -10.991255.999 -0.558 -4.165255.99 10.343 -11.034 255.999 -1.230 -3.583 255.99 10.282 -11.077255.999 -1.886 -2.983255.999 10.199 -11.110 255.999 -2.526 -2.366 255.999 10.081 -11.119255.999 -3.146 -1.727255.999 9.933 -11.073255.99 -3.744 -1.064255.999 9.765 -10.976255.999 -4.317 -0.373 255.99 -4.864 0,24028 255.999 -8.658 9.770 258.001 -5.383 1.085255.999 -8.635 9.767258.001 -5.861 1.816 255.99 -8.593 9.746 258.001 -6.301 2.535 255.999 -8.538 9.700 258.001 -6.704 3.242 255.99 -8.452 9.604 258.001 -7.070 3.934 255.999 -8.34 9.465 258.001 -7.401 4.611255.99 -8.222 9.274258.001 -7.697 5.271255.999 -8.069 9.031258.001 -7.962 5.912 255.99 -7.877 8.711258.001 -8.194 6.533 255.999 -7.657 8.34 258.001 -8.387 7.104255.99 -7.41 7.947258.001 -8.547 7.623255.99 -7.14 7.508 258.001 -8.675 8.088255.999 -6.840 7.022258.001 -8.783 8.528 255.99 -6.494 6.493 258.001 -8.864 8.911255.999 -6.123 5.948258.001 -8.914 9.209 255.999 -5.72 5.385 258.001 -8.940 9.449 255.999 -5.304 4.805 258.001 -8.945 9.630255.99 -4.855 4.211258.001 -8.932 9.765 255.999 -4.377 3.601 258.001 -8.911 9.837 255.999 -3.871 2.978258.001 -8.887 9.878 255.99 -3.333 2.342 258.001 -8.86 9.894255.99 -2.766 1.694258.001 -8.858 9.90 255.999 -2.18 1.055 258.001 -8.675 9.767258.001 -1.60 0,29514258.001 -8.669 9.76 258.001 -1.004 -0.198258.001 -0.402 -0.814 258.001 10.731 -10.780 258.001 0,14236 -1.425 258.001 10.74 -10.863 258.001 0,56736 -2.031258.001 10.744 -10.93 258.001 1.433 -2.63 258.001 10.727 -10.988 258.001 2.053 -3.232258.001 10.707 -11.026258.001 2.677 -3.827 258.001 10.680 -11.062 258.001 3.304 -4.418258.001 10.63 -11.102258.001 3.933 -5.00 258.001 10.570 -11.137258.001 4.545 -5.571258.001 10.482 -11.152258.001 5.139 -6.113258.001 10.366 -11.127258.001 5.715 -6.632258.001 10.233 -11.049258.001 6.274 -7.127 258.001 10.067 -10.94 258.001 6.815 -7.600258.001 9.866 -10.828258.001 7.337 -8.049258.001 9.62 -10.684258.001 7.841 -8.47 258.001 9.346 -10.517258.001 8.305 -8.861258.001 9.013 -10.321258.001 8.728 -9.206258.001 8.62 -10.094258.001 9.109 -9.512 258.001 8.19 -9.837258.001 9.448 -9.778 258.001 7.710 -9.547 258.001 9.744 -10.005 258.001 7.176 -9.224 258.001 9.997 -10.194 258.001 6.594 -8.867 258.001 10.215 -10.354258.001 5.990 -8.489258.001 10.399 -10.48 258.001 5.36 -8.089 258.001 10.552 -10.594258.001 4.718 -7.666258.001 10.671 -10.684258.001 4.052 -7.21 258.001 3.368 -6.746258.001 -8.559 8.404258.001 2.667 -6.245 258.001 -8.653 8.782 258.001 1.952 -5.71 258.001 -8.713 9.076 258.001 1.247 -5.175 258.001 -8.746 9.313 258.001 0,38472 -4.623 258.001 -8.757 9.493 258.001 -0.127 -4.057 258.001 -8.749 9.62 258.001 -0.794 -3.47 258.001 -8.731 9.700258.001 -1.448 -2.882258.001 -8.708 9.742258.001 -2.087 -2.272 258.001 -8.691 9.759 258.001 -2.710 -1.644 258.001 -8.680 9.765 258.001 -3.314 -0.995 258.001 -8.508 9.651259.194 -3.895 -0.323258.001 -8.503 9.652259.194 -4.45 0,25903 258.001 -8.491 9.65 259.19 -4.991 1.094 258.001 -8.468 9.651259.194 -5.485 1.807258.001 -8.427 9.631259.194 -5.94 2.511258.001 -8.371 9.586 259.194 -6.356 3.203 258.001 -8.283 9.491259.194 -6.736 3.884 258.001 -8.177 9.355 259.194 -7.08 4.54 258.001 -8.046 9.168 259.194 -7.389 5.198 258.001 -7.887 8.929 259.194 -7.668 5.828 258.001 -7.688 8.614 259.194 -7.915 6.439 258.001 -7.459 8.249 259.194 -8.123 7.002 258.001 -7.212 7.863 259.194 -8.297 7.513 258.001 -6.931 7.429 259.19 -8.438 7.971258.001 -6.615 6.950259.19 -6.261 6.428 259.194 7.555 -8.105 259.194 -5.882 5.888 259.194 8.055 -8.535 259.194 -5.480 5.331259.194 8.515 -8.924 259.194 -5.052 4.75 259.194 8.933 -9.273 259.19 -4.598 4.166259.194 9.311 -9.582259.194 -4.11 3.561259.194 9.64 -9.851259.19 -3.607 2.941259.194 9.940 -10.081259.194 -3.069 2.307259.19 10.19 -10.273259.19 -2.502 1.66 259.194 10.406 -10.435259.194 -1.925 1.022259.194 10.588 -10.57 259.19 -1.33 0,27222259.194 10.73 -10.67 259.194 -0.745 -0.231259.194 10.86 -10.76 259.194 -0.144 -0.847259.194 10.943 -10.845 259.194 0,32083 -1.458259.194 10.975 -10.924259.194 1.073 -2.064259.194 10.978 -10.996 259.19 1.68 -2.66 259.194 10.963 -11.052259.194 2.304 -3.266259.194 10.943 -11.090259.19 2.925 -3.862 259.194 10.915 -11.125 259.194 3.54 -4.454259.194 10.868 -11.161259.194 4.175 -5.044259.194 10.798 -11.18 259.194 4.784 -5.611259.194 10.70 -11.185 259.194 5.374 -6.155 259.194 10.603 -11.133 259.19 5.946 -6.677 259.194 10.472 -11.052 259.194 6.501 -7.176259.194 10.30 -10.951259.194 7.037 -7.652 259.194 10.11 -10.828 259.194 9.873 -10.683259.194 -4.622 1.069259.19 9.595 -10.513 259.194 -5.124 1.773 259.194 9.266 -10.314 259.194 -5.588 2.470259.194 8.88 -10.085 259.194 -6.014 3.155 259.194 8.456 -9.824 259.194 -6.405 3.828 259.194 7.977 -9.531259.194 -6.760 4.486259.194 7.44 -9.204259.194 -7.084 5.127259.194 6.873 -8.842 259.194 -7.377 5.750 259.194 6.275 -8.460259.194 -7.640 6.353259.194 5.655 -8.05 259.194 -7.864 6.909259.194 5.015 -7.630 259.194 -8.053 7.413 259.194 4.355 -7.18 259.194 -8.209 7.866 259.19 3.678 -6.705 259.194 -8.345 8.294 259.19 2.985 -6.205 259.194 -8.451 8.668 259.194 2.278 -5.676259.194 -8.521 8.959259.194 1.581 -5.137259.19 -8.563 9.195259.19 0,62222 -4.586259.19 -8.580 9.37 259.194 0,15417 -4.023 259.194 -8.577 9.50 259.194 -0.440 -3.446259.194 -8.562 9.582259.194 -1.088 -2.855 259.194 -8.54 9.625 259.194 -1.722 -2.24 259.194 -8.524 9.642259.194 -2.34 -1.626259.194 -8.514 9.648259.194 -2.941 -0.984 259.194 -8.337 9.565 260.388 -3.522 -0.322259.194 -8.331 9.567260.388 -4.082 0,25139259.194 -8.320 9.56 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-2.400283.792 10.135 -15.258283.792 0.022 -3.132 283.79 10.217 -15.348 283.79 0,40069 -3.86 283.792 10.249 -15.43 283.792 1.13 -4.588 283.792 10.245 -15.510 283.79 1.697 -5.313 283.792 10.223 -15.567 283.792 2.261 -6.036 283.792 10.196 -15.605 283.792 2.829 -6.756283.79 10.160 -15.635 283.792 3.399 -7.473 283.792 10.10 -15.66 283.792 10.027 -15.67 283.792 -0.68 -4.837283.792 9.938 -15.641283.792 -1.25 -4.108 283.792 9.843 -15.561283.792 -1.813 -3.369283.79 9.72 -15.453 283.792 -2.35 -2.621283.792 9.574 -15.31 283.792 -2.893 -1.864283.792 9.391 -15.155 283.79 -3.417 -1.098 283.792 9.174 -14.961283.792 -3.931 -0.324283.792 8.919 -14.73 283.792 -4.41 0,30139283.792 8.617 -14.46 283.792 -4.875 1.173 283.792 8.269 -14.158 283.792 -5.307 1.891283.792 7.87 -13.807 283.792 -5.713 2.589 283.792 7.438 -13.412 283.792 -6.093 3.265 283.792 6.957 -12.97 283.79 -6.45 3.920283.792 6.433 -12.490283.792 -6.784 4.551283.792 5.891 -11.981283.792 -7.094 5.160283.792 5.331 -11.445 283.792 -7.37 5.71 283.792 4.755 -10.883 283.792 -7.611 6.221283.792 4.164 -10.293 283.79 -7.818 6.672 283.79 3.558 -9.675 283.792 -8.00 7.09 283.792 2.940 -9.028 283.792 -8.163 7.471283.792 2.31 -8.351283.792 -8.27 7.76 283.792 1.689 -7.666 283.79-8.355 7.995 283.79 1.07 -6.97 283.792 -8.402 8.17 283.792 0,33264 -6.270 283.792 -8.423 8.314 283.792 -0.110 -5.558 283.792 -8.423 8.391283.792 -8.411 8.440 283.792 -2.741 0,39514 285.054 -8.398 8.461283.792 -2.202 -0.185 285.054 -8.38 8.46 283.792 -1.66 -0.93 285.05 -8.429 8.614 285.054 -1.113 -1.686285.054 -8.423 8.617 285.054 -0.565 -2.433 285.05 -8.411 8.62 285.05 -0.013 -3.177 285.054 -8.386 8.617285.054 0,37639 -3.92 285.054 -8.34 8.597 285.05 1.10 -4.66 285.05 -8.278 8.550 285.05 1.661 -5.398 285.05 -8.179 8.452 285.054 2.224 -6.135 285.054 -8.061 8.30 285.05 2.78 -6.86 285.05 -7.911 8.113 285.054 3.358 -7.601285.054 -7.730 7.862 285.054 3.931 -8.33 285.054 -7.502 7.532 285.054 4.487 -9.032 285.054 -7.241 7.148 285.054 5.028 -9.707 285.054 -6.96 6.73 285.054 5.553 -10.356285.05 -6.65 6.277 285.054 6.062 -10.977 285.05 -6.311 5.764 285.054 6.555 -11.572 285.054 -5.932 5.19 285.05 7.031 -12.141285.05 -5.535 4.609 285.054 7.490 -12.683 285.054 -5.120 3.995 285.054 7.914 -13.175 285.054 -4.685 3.357 285.05 8.299 -13.617 285.054 -4.230 2.695 285.054 8.647 -14.011285.054 -3.755 2.00 285.05 8.95 -14.35 285.054 -3.259 1.300 285.05 9.227 -14.653 285.05 9.458 -14.902285.054 6.336 -12.736285.054 9.658 -15.113285.05 5.788 -12.219285.054 9.827 -15.289285.054 5.222 -11.675285.054 9.96 -15.43 285.05 4.64 -11.10 285.05 10.079 -15.549 285.054 4.043 -10.504 285.054 10.162 -15.639 285.054 3.433 -9.87 285.05 10.196 -15.727 285.054 2.811 -9.217 285.054 10.192 -15.805 285.054 2.177 . -8.528 285.05 10.170 -15.863 285.054 1.554 -7.831285.054 10.142 -15.901285.05 0,65417 -7.12 285.054 10.106 -15.932285.054 0,23681 -6.409285.054 10.048 -15.95 285.05 -0.24 -5.68 285.054 9.970 -15.966 285.054 -0.826 -4.950 285.054 9.881 -15.935 285.05-1.392 -4.208285.05 9.786 -15.853285.054 -1.948 -3.456285.054 9.664 -15.743 285.05 -2.491 -2.695 285.054 9.513 -15.607285.054 -3.023 -1.924285.054 9.328 -15.441285.05 -3.543 -1.14 285.054 9.109 -15.243 285.05 -4.051 -0.355 285.054 8.851 -15.013 285.05 -4.532 0,2888 285.054 8.54 -14.742 285.05 -4.98 1.170285.054 8.194 -14.42 285.054 -5.413 1.903 285.054 7.79 -14.072285.05 -5.815 2.61 285.054 7.353 -13.672285.054 -6.191 3.306285.054 6.86 -13.227285.05 -6.54 3.97 285.05 -6.873 4.618 285.05 -7.61 7.96 288.00 -7.179 5.239285.05 -7.35 7.56 288.000 -7.450 5.807 285.054 -7.079 7.138288.000 -7.68 6.321285.05 -6.772 6.65 288.000 -7.89 6.782 285.05 -6.43 6.125 288.00 -8.073 7.21 285.05 -6.057 5.538 288.00 -8.226 7.596 285.054 -5.664 4.925 288.000 -8.335 7.891285.05 -5.253 4.28 288.00 -8.411 8.131285.05 -4.82 3.622 288.000 -8.455 8.31 285.05 -4.374 2.933 288.000 -8.473 8.455 285.054 -3.905 2.219 288.00 -8.47 8.533 285.05 -3.415 1.48 288.00 -8.457 8.582285.05 -2.905 0,49792288.00 -8.443 8.603 285.054 -2.373 -0.069 288.00 -8.434 8.611285.054 -1.838 -0.853 288.000 -8.54 9.08 288.00 -1.30 -1.635 288.00 -8.538 9.088 288.00 -0.758 -2.415 288.000 -8.525 9.091288.000 -0.214 -3.194 288.000 -8.500 9.088 288.000 0,23125 -3.970 288.000 -8.45 9.06 288.00 0,6131 -4.743 288.00 -8.391 9.018 288.000 1.435 -5.51 288.00 -8.291 8.915 288.000 1.99 -6.286 288.000 -8.172 8.768 288.00 2.547 -7.055 288.00 -8.021 8.56 288.00 3.107 -7.822 288.00 -7.840 8.305 288.000 3.671 -8.585 288.000 4.220 -9.321288.00 9.573 -16.528288.000 4.754 -10.028288.000 9.47 -16.442288.00 5.273 -10.707 288.00 9.354 -16.328 288.00 5.776 -11.358 288.000 9.199 -16.18 288.000 6.263 -11.982288.00 9.011 -16.01 288.00 6.735 -12.577288.000 8.78 -15.81 288.00 7.190 -13.145 288.000 8.525 -15.571288.000 7.611 -13.660288.00 8.215 -15.28 288.00 7.994 -14.123 288.000 7.857 -14.963 288.000 8.341 -14.535 288.000 7.453 -14.593 288.00 8.64 -14.89 288.00 7.003 -14.177 288.00 8.919 -15.206288.000 6.510 -13.713288.000 9.151 -15.46 288.00 5.973 -13.202 288.00 9.351 -15.68 288.000 5.417 -12.66 288.000 9.521 -15.869288.000 4.845 -12.094288.000 9.662 -16.02 288.00 4.258 -11.498288.000 9.775 -16.139288.000 3.657 -10.872288.000 9.86 -16.232 288.003.043 -10.215 288.00 9.89 -16.321288.00 2.418 -9.527288.00 9.893 -16.401288.000 1.784 -8.807 288.000 9.86 -16.461288.00 1.161 -8.078 288.00 9.84 -16.50 288.000 0,3819 -7.339 288.00 9.803 -16.531288.000 -0.048 -6.591288.00 9.74 -16.558 288.00 -0.63 -5.833 288.00 9.663 -16.563 288.000 -1.203 -5.065 288000 -1.762 -4.287288.00 -8.597 8.92 288.000 -2.309 -3.501288.00 -8.591 9.00 288.00 -2.843 -2.705 288.000 -8.575 9.053 288.00 -3.364 -1.899288.000 -8.55 9.07 288.00 -3.873 -1.08 288.000 -8.54 9.082288.00 -4.37 -0.26 288.00 -4.838 0,37847 288.00 -5.280 1.331288.00 -5.695 2.096 288.00 -6.084 2.84 288.000 -6.448 3.560 288.000 -6.788 4.257 288.000 -7.103 4.92 288.00 -7.396 5.57 288.00 -7.654 6.168 288.00 -7.877 6.705 288.000 -8.068 7.184288.000 -8.24 7.637 288.00 -8.38 8.033 288.00 -8.48 8.34 288.000 -8.54 8.58 288.00 -8.585 8.77 288.00 At the same time, each blade 10 therefore has an aerodynamic profile which allows a high conversion efficiency and a high useful life to be maintained.

Furthermore, the aerodynamic profile of the blade 10 according to the invention is obtained with the values of Table I by piling up the series of closed curves and grouping them so as to obtain a continuous aerodynamic profile.

In order to take into account the dimensional variability of each blade 10, the profile of each blade 10 can have a tolerance of +/- 2 mm in a normal direction with respect to the profile of the blade 10 itself.

The profile of each blade 10 can also comprise a coating, applied subsequently and which varies the profile itself.

Said antiwear coating preferably has a thickness defined in a normal direction at each surface of the blade 10 and ranging from 0 to 0.5 mm.

It is evident, moreover, that the values of the coordinates of Table I can be multiplied or divided by a corrective constant to obtain a profile in a greater or smaller scale, maintaining the same form.

According to another aspect of the present invention, a rotor of a ninth phase of a compressor is provided, which comprises a series of blades 10 of the type described above, each of which having a shaped aerodynamic profile, which are fixed to an outer surface of said rotor so as to be uniformly distanced thereon, and also oriented so as to confer a high efficiency to the compressor in which said rotor is preferably in-serted.

According to another aspect of the present invention, a compressor is provided, com-prising a rotor of the type described above.

It can thus be seen that a blade of a rotor of a ninth phase of a compressor according to the present invention achieves the objectives specified above.

The rotor blade of a ninth phase of a compressor of the present invention thus con-ceived, can undergo numerous modifications and variants, all included in the same in-ventive concept.

Furthermore, in practice, the materials used, as also the dimensions and components, can vary according to technical requirements.

Claims (12)

1. A blade (10) of a rotor of a ninth phase of a compressor, which can be defined by coordinates of a discreet combination of points, in a Cartesian reference system (X, Y, Z), wherein the axis (Z) is a radial axis intersecting the central axis of the compressor, said blade (10) having a profile which can be identified by means of a series of closed intersection curves between the profile itself and planes (X, Y) lying at distances (Z) from the central axis, said blade (10) being characterized in that it comprises a thickening (30), substantially parallel to a base portion (12) of the blade (10) itself, fixable to said rotor, said thickening (30) being substantially situated half-way up the blade (10) and being suitable for shifting the natural resonance frequencies of the blade (10) itself outside a functioning frequency range of said rotor.
2. The blade (10) according to claim 1, characterized in that it com-prises a further thickening, substantially parallel to said base portion (12) and situated in particular close to a free end (14).
3. The blade (10) according to claim 1 or 2, characterized in that it comprises a profile which is identified by a first substantially concave surface (3), which is pressurized, and a second substantially convex surface (5) which is in de-pression and which is opposite to the first, said two surfaces (3, 5) being continuous and joined to each other to form the profile of said blade 10.
4. The blade (10) according to claim 3, characterized in that each closed curve has a maximum thickness determined by the maximum distance between said first surface (3) and said second surface (5), said maximum thickness of each closed curve, along the height of the blade 10 in the direction of a free end (14) of the blade (10), first having a decreasing and then an increasing trend, followed again by a decreasing and finally increasing trend, with a discontinuity point of the slope.
5. The blade (10) according to claim 4, characterized in that along the height of the blade (10) in the direction of its free end (14), said maximum thickness has a trend according to the following equations, wherein h represents the height of the blade (10), expressed as a percentage of the total height of the blade (10), and wherein Tmax is the maximum adimensionalized thickness relating to the closed curve corresponding to the height:

Tmax =-34.522*h4 + 36.4*h3 - 8.4113*h2 - 0.7259*h + 0.9961 for height values ranging from 0 to 45%;
Tmax = -1.3509*h + 1.4459 for a height ranging from 45% to 58%;
Tmax = 0.2074*h + 0.5443 for a height ranging from 58% to 86%;
Tmax = 0.9058*h - 0.0518 for a height ranging from 86% to 100%.
6. The blade (10) according to any of the previous claims, character-ized in that said closed curves are defined according to Table I, whose values, ex-pressed in millimeters, refer to a profile at room temperature.
7. The blade (10) according to any of the previous claims, character-ized in that the profile of each blade (10) has a tolerance of +/- 2 mm in a normal di-rection with respect to the profile of the blade 10 itself.
8. The blade (10) according to any of the previous claims, character-ized in that the profile of each blade (10) comprises an antiwear coating.
9. The blade (10) according to claim 8, characterized in that said coat-ing has a thickness ranging from 0 to 0.5 mm.
10. A rotor of a ninth phase of a compressor, characterized in that it comprises a series of blades (10) according to any of the claims 1-9.
11. The rotor according to claim 10, characterized in that said series of blades (10) is constrained to an outer surface of said rotor and said series of blades (10) is also uniformly distributed thereon in order to maximize the efficiency of the rotor itself.
12. A compressor characterized in that it comprises a rotor according to claim 10 or 11.
CA2579387A 2006-02-27 2007-02-22 Rotor blade for a ninth phase of a compressor Expired - Fee Related CA2579387C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000341A ITMI20060341A1 (en) 2006-02-27 2006-02-27 SHOVEL OF A ROTOR OF A NON-STAGE OF A COMPRESSOR
ITMI2006A000341 2006-02-27

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CN101029647B (en) 2014-11-26
JP5314852B2 (en) 2013-10-16
CA2579387C (en) 2015-10-20
KR20070089080A (en) 2007-08-30
EP1826413A3 (en) 2010-09-22
ITMI20060341A1 (en) 2007-08-28
NO20071076L (en) 2007-08-28
ATE531944T1 (en) 2011-11-15
JP2007231946A (en) 2007-09-13

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